diff --git a/source/games/blood/src/actor.cpp b/source/games/blood/src/actor.cpp
index 3ee8cf4e6..c41f5c39e 100644
--- a/source/games/blood/src/actor.cpp
+++ b/source/games/blood/src/actor.cpp
@@ -2663,7 +2663,7 @@ void actRadiusDamage(DBloodActor* source, int x, int y, int z, int nSector, int
 				if (act2->hasX())
 				{
 					if (pSprite2->flags & 0x20) continue;
-					if (!sectorMap[pSprite2->sectnum]) continue;
+					if (!CheckSector(sectorMap, pSprite2)) continue;
 					if (!CheckProximity(act2, x, y, z, nSector, nDist)) continue;
 
 					int dx = abs(x - pSprite2->x);
@@ -2690,7 +2690,7 @@ void actRadiusDamage(DBloodActor* source, int x, int y, int z, int nSector, int
 			auto pSprite2 = &act2->s();
 
 			if (pSprite2->flags & 0x20) continue;
-			if (!sectorMap[pSprite2->sectnum]) continue;
+			if (!CheckSector(sectorMap, pSprite2)) continue;
 			if (!CheckProximity(act2, x, y, z, nSector, nDist)) continue;
 
 			XSPRITE* pXSprite2 = &act2->x();
@@ -5923,7 +5923,7 @@ static void actCheckExplosion()
 
 			if (pDude->flags & 32) continue;
 
-			if (sectorMap[pDude->sectnum])
+			if (CheckSector(sectorMap, pDude))
 			{
 				if (pXSprite->data1 && CheckProximity(dudeactor, x, y, z, nSector, radius))
 				{
@@ -5952,7 +5952,7 @@ static void actCheckExplosion()
 
 			if (pThing->flags & 32) continue;
 
-			if (sectorMap[pThing->sectnum])
+			if (CheckSector(sectorMap, pThing))
 			{
 				if (pXSprite->data1 && CheckProximity(thingactor, x, y, z, nSector, radius) && thingactor->hasX())
 				{
@@ -5996,7 +5996,7 @@ static void actCheckExplosion()
 					spritetype* pDebris = &physactor->s();
 					if (pDebris->sectnum < 0 || (pDebris->flags & kHitagFree) != 0) continue;
 
-					if (!sectorMap[pDebris->sectnum] || !CheckProximity(physactor, x, y, z, nSector, radius)) continue;
+					if (!CheckSector(sectorMap, pDebris) || !CheckProximity(physactor, x, y, z, nSector, radius)) continue;
 					else debrisConcuss(Owner, i, x, y, z, pExplodeInfo->dmgType);
 				}
 			}
@@ -6008,9 +6008,9 @@ static void actCheckExplosion()
 					if (gImpactSpritesList[i] == nullptr) continue;
 
 					auto impactactor = gImpactSpritesList[i];
-					if (!impactactor->hasX() || impactactor->s().sectnum < 0 || (impactactor->s().flags & kHitagFree) != 0)	continue;
+					if (!impactactor->hasX() || !impactactor->s().insector() || (impactactor->s().flags & kHitagFree) != 0)	continue;
 
-					if (/*pXImpact->state == pXImpact->restState ||*/ !sectorMap[impactactor->s().sectnum] || !CheckProximity(impactactor, x, y, z, nSector, radius))
+					if (!CheckSector(sectorMap, &impactactor->s()) || !CheckProximity(impactactor, x, y, z, nSector, radius))
 						continue;
 
 					trTriggerSprite(impactactor, kCmdSpriteImpact);
diff --git a/source/games/blood/src/aibeast.cpp b/source/games/blood/src/aibeast.cpp
index e07a4672c..93969f99f 100644
--- a/source/games/blood/src/aibeast.cpp
+++ b/source/games/blood/src/aibeast.cpp
@@ -110,7 +110,7 @@ void StompSeqCallback(int, DBloodActor* actor1)
 					continue;
 				if (pSprite2->flags & 32)
 					continue;
-                if (sectorMap[pSprite2->sectnum] && CheckProximity(actor2, x, y, z, nSector, vc))
+                if (CheckSector(sectorMap, pSprite2) && CheckProximity(actor2, x, y, z, nSector, vc))
 				{
 					int top, bottom;
 					GetActorExtents(actor1, &top, &bottom);
@@ -141,7 +141,7 @@ void StompSeqCallback(int, DBloodActor* actor1)
 		spritetype* pSprite2 = &actor2->s();
 		if (pSprite2->flags & 32)
 			continue;
-        if (sectorMap[pSprite2->sectnum] && CheckProximity(actor2, x, y, z, nSector, vc))
+		if (CheckSector(sectorMap, pSprite2) && CheckProximity(actor2, x, y, z, nSector, vc))
 		{
 			XSPRITE* pXSprite = &actor2->x();
 			if (pXSprite->locked)
diff --git a/source/games/blood/src/gameutil.h b/source/games/blood/src/gameutil.h
index 2c1767632..0c7cde597 100644
--- a/source/games/blood/src/gameutil.h
+++ b/source/games/blood/src/gameutil.h
@@ -70,5 +70,10 @@ BitArray GetClosestSpriteSectors(int nSector, int x, int y, int nDist, TArray<wa
 int picWidth(int nPic, int repeat);
 int picHeight(int nPic, int repeat);
 
+inline bool CheckSector(const BitArray& bits, spritetype* spr)
+{
+    return bits[spr->sectnum];
+}
+
 
 END_BLD_NS
diff --git a/source/games/blood/src/weapon.cpp b/source/games/blood/src/weapon.cpp
index c6a434588..30499f8f3 100644
--- a/source/games/blood/src/weapon.cpp
+++ b/source/games/blood/src/weapon.cpp
@@ -2679,7 +2679,7 @@ void teslaHit(DBloodActor *missileactor, int a2)
             spritetype *pHitSprite = &hitactor->s();
             if (pHitSprite->flags&32)
                 continue;
-            if (sectorMap[pHitSprite->sectnum] && CheckProximity(hitactor, x, y, z, nSector, nDist))
+            if (CheckSector(sectorMap, pHitSprite) && CheckProximity(hitactor, x, y, z, nSector, nDist))
             {
                 int dx = pMissile->x-pHitSprite->x;
                 int dy = pMissile->y-pHitSprite->y;
@@ -2696,7 +2696,7 @@ void teslaHit(DBloodActor *missileactor, int a2)
         spritetype *pHitSprite = &hitactor->s();
         if (pHitSprite->flags&32)
             continue;
-        if (sectorMap[pHitSprite->sectnum] && CheckProximity(hitactor, x, y, z, nSector, nDist))
+        if (CheckSector(sectorMap, pHitSprite) && CheckProximity(hitactor, x, y, z, nSector, nDist))
         {
             XSPRITE *pXSprite = &hitactor->x();
             if (!pXSprite->locked)