diff --git a/src/p_map.cpp b/src/p_map.cpp
index 4777d7e9c..7d3474cf1 100644
--- a/src/p_map.cpp
+++ b/src/p_map.cpp
@@ -4478,7 +4478,7 @@ void P_RadiusAttack (AActor *bombspot, AActor *bombsource, int bombdamage, int b
 	AActor *thing;
 
 	if (flags & RADF_SOURCEISSPOT)
-	{ // The source is actually the same as the spot, even if that wasn't what we receized.
+	{ // The source is actually the same as the spot, even if that wasn't what we received.
 		bombsource = bombspot;
 	}
 
@@ -4567,11 +4567,12 @@ void P_RadiusAttack (AActor *bombspot, AActor *bombsource, int bombdamage, int b
 			}
 			points *= thing->GetClass()->Meta.GetMetaFixed(AMETA_RDFactor, FRACUNIT)/(double)FRACUNIT;
 
-			if (points > 0.f && P_CheckSight (thing, bombspot, SF_IGNOREVISIBILITY|SF_IGNOREWATERBOUNDARY))
+			// points and bombdamage should be the same sign
+			if ((points * bombdamage) > 0 && P_CheckSight (thing, bombspot, SF_IGNOREVISIBILITY|SF_IGNOREWATERBOUNDARY))
 			{ // OK to damage; target is in direct path
 				double velz;
 				double thrust;
-				int damage = (int)points;
+				int damage = abs((int)points);
 				int newdam = damage;
 
 				if (!(flags & RADF_NODAMAGE))
diff --git a/src/thingdef/thingdef_codeptr.cpp b/src/thingdef/thingdef_codeptr.cpp
index c1ff7853d..542ab1698 100644
--- a/src/thingdef/thingdef_codeptr.cpp
+++ b/src/thingdef/thingdef_codeptr.cpp
@@ -838,8 +838,8 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_RadiusThrust)
 
 	bool sourcenothrust = false;
 
-	if (force <= 0) force = 128;
-	if (distance <= 0) distance = force;
+	if (force == 0) force = 128;
+	if (distance <= 0) distance = abs(force);
 
 	// Temporarily negate MF2_NODMGTHRUST on the shooter, since it renders this function useless.
 	if (!(flags & RTF_NOTMISSILE) && self->target != NULL && self->target->flags2 & MF2_NODMGTHRUST)
@@ -847,7 +847,6 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_RadiusThrust)
 		sourcenothrust = true;
 		self->target->flags2 &= ~MF2_NODMGTHRUST;
 	}
-	int sourceflags2 = self->target != NULL ? self->target->flags2 : 0;
 
 	P_RadiusAttack (self, self->target, force, distance, self->DamageType, flags | RADF_NODAMAGE, fullthrustdistance);
 	P_CheckSplash(self, distance << FRACBITS);