[hellfire] AddAcid bin exact (#1514)

* [hellfire] AddAcid bin exact

* else

Source/missiles.cpp

@@ -1879,10 +1879,17 @@ void AddAcid(int mi, int sx, int sy, int dx, int dy, int midir, char mienemy, in
 {
 	GetMissileVel(mi, sx, sy, dx, dy, 16);
 	SetMissDir(mi, GetDirection16(sx, sy, dx, dy));
+#ifdef HELLFIRE
+	if (missile[mi]._mixvel & 0xFFFF0000 || missile[mi]._miyvel & 0xFFFF0000)
+		missile[mi]._mirange = 5 * (monster[id]._mint + 4);
+	else
+		missile[mi]._mirange = 1;
+#else
+	missile[mi]._mirange = 5 * (monster[id]._mint + 4);
+#endif
 	missile[mi]._mlid = -1;
 	missile[mi]._miVar1 = sx;
 	missile[mi]._miVar2 = sy;
-	missile[mi]._mirange = 5 * (monster[id]._mint + 4);
 	PutMissile(mi);
 }