Okay, more trouble.

I now have spawning objects in relevance to player position covered, but now I'm having trouble with object behavior. Specifically, I'm trying to spawn falling bricks that would behave exactly as if spawned by the Queen boss, minus the damage effect. Spawning works like it should, but the behavior is a problem. I looked through the documentation and I understand that enemy projectiles are unaccessible as objects as of now, so I had to experiment. Closest I got so far is modifying RF projectiles, which leave a rockety trail and explode on contact. It looks kind of cool, but because of the object type I don't know how to make them ignore walls they would fall from and I'd rather have them bump on a surface and then fall a little ways down like they originally do instead of exploding with a recoil effect (I'm doing this thing for a dramatic effect, not as harmful obstacles). Any suggestions?