diff --git a/source/games/blood/src/aicerber.cpp b/source/games/blood/src/aicerber.cpp
index 02959b2eb..2ef46a66b 100644
--- a/source/games/blood/src/aicerber.cpp
+++ b/source/games/blood/src/aicerber.cpp
@@ -338,9 +338,9 @@ static void cerberusThinkChase(DBloodActor* actor)
 	auto target = actor->GetTarget();
 
 	auto dvec = target->spr.pos.XY() - actor->spr.pos.XY();
-	int nAngle = getangle(dvec);
-	int nDist = approxDist(dvec);
-	aiChooseDirection(actor, DAngle::fromBuild(nAngle));
+	DAngle nAngle = VecToAngle(dvec);
+	double nDist = dvec.Length();
+	aiChooseDirection(actor, nAngle);
 
 	if (target->xspr.health == 0) {
 		switch (actor->spr.type) {
@@ -367,16 +367,18 @@ static void cerberusThinkChase(DBloodActor* actor)
 	}
 
 
-	if (nDist <= pDudeInfo->seeDist)
+	if (nDist <= pDudeInfo->SeeDist())
 	{
-		int nDeltaAngle = getincangle(actor->int_ang(), nAngle);
+		DAngle nDeltaAngle = absangle(actor->spr.angle, nAngle);
 		double height = (pDudeInfo->eyeHeight * actor->spr.yrepeat) * REPEAT_SCALE;
 		if (cansee(target->spr.pos, target->sector(), actor->spr.pos.plusZ(-height), actor->sector()))
 		{
-			if (nDist < pDudeInfo->seeDist && abs(nDeltaAngle) <= pDudeInfo->periphery) {
+			if (nDist < pDudeInfo->SeeDist() && nDeltaAngle <= pDudeInfo->Periphery())
+			{
 				aiSetTarget(actor, actor->GetTarget());
 
-				if (nDist < 0x1b00 && nDist > 0xd00 && abs(nDeltaAngle) < 85) {
+				if (nDist < 0x1b0 && nDist > 0xd0 && nDeltaAngle < DAngle15) 
+				{
 					switch (actor->spr.type) {
 					case kDudeCerberusTwoHead:
 						aiNewState(actor, &cerberusBurn);
@@ -387,7 +389,8 @@ static void cerberusThinkChase(DBloodActor* actor)
 					}
 				}
 
-				else if (nDist < 0xb00 && nDist > 0x500 && abs(nDeltaAngle) < 85) {
+				else if (nDist < 0xb0 && nDist > 0x50 && nDeltaAngle < DAngle15)
+				{
 					switch (actor->spr.type) {
 					case kDudeCerberusTwoHead:
 						aiNewState(actor, &cerberus3Burn);
@@ -397,11 +400,9 @@ static void cerberusThinkChase(DBloodActor* actor)
 						break;
 					}
 				}
-				else if (nDist < 0x200 && abs(nDeltaAngle) < 85)
+				else if (nDist < 0x20 && nDeltaAngle < DAngle15)
 				{
-					int dx = dvec.X * worldtoint;
-					int dy = dvec.Y * worldtoint;
-					int hit = HitScan(actor, actor->spr.pos.Z, dx, dy, 0, CLIPMASK1, 0);
+					int hit = HitScan(actor, actor->spr.pos.Z, DVector3(dvec, 0), CLIPMASK1, 0);
 					switch (actor->spr.type) {
 					case kDudeCerberusTwoHead:
 						switch (hit) {