diff --git a/src/Dodge/Creature/ReaderUpdate.hs b/src/Dodge/Creature/ReaderUpdate.hs
index 68870b2b8..d51b16aa3 100644
--- a/src/Dodge/Creature/ReaderUpdate.hs
+++ b/src/Dodge/Creature/ReaderUpdate.hs
@@ -106,6 +106,7 @@ flockACC w cr = fromMaybe cr $ do
         macr =
             safeMinimumOn (dist cpos . (^. crPos . _xy))
                 . filter isFarACC
+                . IM.elems
                 $ crsNearCirc cpos 50 w
     return $ case macr of
             Nothing -> cr
diff --git a/src/Dodge/Creature/State.hs b/src/Dodge/Creature/State.hs
index 41d06901e..ad4f9b299 100644
--- a/src/Dodge/Creature/State.hs
+++ b/src/Dodge/Creature/State.hs
@@ -4,6 +4,7 @@ module Dodge.Creature.State (
     invItemEffs,
 ) where
 
+import qualified Data.IntMap.Strict as IM
 import Linear
 import NewInt
 import Control.Applicative
@@ -296,6 +297,7 @@ setRBCreatureTargeting cr w ituse
     newtarg =
         safeMinimumOn (dist mwp . (^. crPos . _xy))
             . filter (canseepos . (^. crPos . _xy))
+            . IM.elems
             $ crsNearCirc mwp 40 w
     canseepos p = hasLOS ((^. crPos . _xy) cr) p w
     mwp = w ^. cWorld . lWorld . lAimPos
diff --git a/src/Dodge/Update.hs b/src/Dodge/Update.hs
index 230874c6c..adadfa055 100644
--- a/src/Dodge/Update.hs
+++ b/src/Dodge/Update.hs
@@ -966,43 +966,40 @@ radiusSpring r a b
 
 simpleCrSprings :: World -> World
 simpleCrSprings w =
-    IM.foldl' (flip crSpring) (w & cWorld . lWorld . lTestString .~ mempty) $
-        IM.filter (\cr -> cr ^. crPos . _z >= 0) $ w ^. cWorld . lWorld . creatures
+    IM.foldl' (flip crSpring) w $
+        IM.filter (canSpring) $ w ^. cWorld . lWorld . creatures
 
 -- note that this may in rare cases not push creatures away from each other
 crSpring :: Creature -> World -> World
 crSpring c w =
-    foldl' (flip $ crCrSpring c) w $
-        crsNearCirc
-            (c ^. crPos . _xy)
-            (crRad $ c ^. crType)
-            w
+    IM.foldl' (flip $ crCrSpring c) w . IM.filter canSpring $
+        crsNearCirc (c ^. crPos . _xy) (crRad $ c ^. crType) w
+
+canSpring :: Creature -> Bool
+canSpring cr = cr ^. crPos . _z >= 0 && case cr ^. crHP of
+    HP{} -> True
+    CrIsCorpse{} -> True
+    CrIsGibs -> False
+    CrIsPitted -> False
 
 crCrSpring :: Creature -> Creature -> World -> World
 crCrSpring c1 c2
     | id1 == id2 = id
     | vec == V2 0 0 = id
-    | diff >= comRad || nopush c1 || nopush c2 
-        = id
+    | diff >= comRad = id
     | otherwise =
-        (cWorld . lWorld . creatures
-            %~ ( (ix id1 . crPos . _xy +~ overlap1)
-                    . (ix id2 . crPos . _xy -~ overlap2)
-               ))
-        . (cWorld . lWorld . lTestString .:~ show id1 <> " " <> show id2 )
+        ( cWorld . lWorld . creatures
+            %~ ( (ix id1 . crPos . _xy +~ overlap c2)
+                    . (ix id2 . crPos . _xy -~ overlap c1)
+               )
+        )
   where
-    nopush cr = case cr ^. crHP of
-        HP {} -> False
-        CrIsCorpse {} -> False
-        CrIsGibs -> True
-        CrIsPitted -> True
     id1 = _crID c1
     id2 = _crID c2
     vec = c1 ^. crPos . _xy - c2 ^. crPos . _xy
     diff = magV vec
     comRad = crRad (c1 ^. crType) + crRad (c2 ^. crType)
-    overlap1 = ((comRad - diff) * crMass (_crType c2) * 0.5 / massT) *^ signorm vec
-    overlap2 = ((comRad - diff) * crMass (_crType c1) * 0.5 / massT) *^ signorm vec
+    overlap c = ((comRad - diff) * crMass (_crType c) * 0.5 / massT) *^ signorm vec
     massT = crMass (_crType c1) + crMass (_crType c2)
 
 updateDelayedEvents :: World -> World
diff --git a/src/Dodge/WorldEvent/ThingsHit.hs b/src/Dodge/WorldEvent/ThingsHit.hs
index e8754e961..20998f813 100644
--- a/src/Dodge/WorldEvent/ThingsHit.hs
+++ b/src/Dodge/WorldEvent/ThingsHit.hs
@@ -181,7 +181,7 @@ wlsHitRadial p r = IM.mapMaybe f . wlsNearCirc p r
 --        v = normalizeV . vNormal . uncurry (-) $ _wlLine wl
 
 crsHitRadial :: Point2 -> Float -> World -> [(Point2, Creature)]
-crsHitRadial p r = mapMaybe f . crsNearCirc p r
+crsHitRadial p r = mapMaybe f . IM.elems . crsNearCirc p r
   where
     f cr = do
         let cp = cr ^. crPos . _xy
diff --git a/src/Dodge/Zoning/Creature.hs b/src/Dodge/Zoning/Creature.hs
index e9232dcbb..ae8f49848 100644
--- a/src/Dodge/Zoning/Creature.hs
+++ b/src/Dodge/Zoning/Creature.hs
@@ -33,8 +33,8 @@ crixsNearSeg = nearSeg crZoneSize _crZoning
 crIXsNearCirc :: Point2 -> Float -> World -> IS.IntSet
 crIXsNearCirc p r = crsNearRect (p + V2 r r) (p - V2 r r)
 
-crsNearCirc :: Point2 -> Float -> World -> [Creature]
-crsNearCirc p r w = mapMaybe (\cid -> w ^? cWorld . lWorld . creatures . ix cid) . IS.toList
+crsNearCirc :: Point2 -> Float -> World -> IM.IntMap Creature
+crsNearCirc p r w = IM.restrictKeys (w ^. cWorld . lWorld . creatures)
     $ crIXsNearCirc p r w
 
 crsNearRect :: Point2 -> Point2 -> World -> IS.IntSet
diff --git a/tags b/tags
index b4a088674..b32dd006c 100644
--- a/tags
+++ b/tags
@@ -2779,6 +2779,7 @@ calcSmoothScroll	src/Dodge/SmoothScroll.hs	11;"	f
 calcTexCoord	src/Tile.hs	19;"	f
 canSee	src/Dodge/Base/Collide.hs	321;"	f
 canSeeIndirect	src/Dodge/Base/Collide.hs	328;"	f
+canSpring	src/Dodge/Update.hs	978;"	f
 cancelExamineInventory	src/Dodge/Item/BackgroundEffect.hs	23;"	f
 capacitor	src/Dodge/Item/Ammo.hs	67;"	f
 card8Vec	src/Dodge/Base/CardinalPoint.hs	17;"	f
@@ -2947,7 +2948,7 @@ crAwayFromPost	src/Dodge/Creature/Test.hs	86;"	f
 crBlips	src/Dodge/RadarSweep.hs	88;"	f
 crCamouflage	src/Dodge/Creature/Picture.hs	33;"	f
 crCanSeeCr	src/Dodge/Creature/Test.hs	53;"	f
-crCrSpring	src/Dodge/Update.hs	982;"	f
+crCrSpring	src/Dodge/Update.hs	985;"	f
 crCurrentEquipment	src/Dodge/Creature/Statistics.hs	62;"	f
 crDeathSounds	src/Dodge/Creature/Vocalization.hs	45;"	f
 crDexterity	src/Dodge/Creature/Statistics.hs	19;"	f
@@ -5402,7 +5403,7 @@ updateCreatureStrides	src/Dodge/Update.hs	370;"	f
 updateDebris	src/Dodge/Update.hs	665;"	f
 updateDebrisChunk	src/Dodge/Prop/Moving.hs	16;"	f
 updateDebugMessageOffset	src/Dodge/Update.hs	102;"	f
-updateDelayedEvents	src/Dodge/Update.hs	1003;"	f
+updateDelayedEvents	src/Dodge/Update.hs	1005;"	f
 updateDisplaySections	src/Dodge/DisplayInventory.hs	116;"	f
 updateDistortion	src/Dodge/Distortion.hs	8;"	f
 updateDistortions	src/Dodge/Update.hs	644;"	f