Bullet not colliding with dying enemy

You could create a new Layer and once the enemy is dying change its layer to that new Layer, and set your bullets to ignore physics on that layer. Would that work?

But if it ignores physics doesnt it fall through the floor?

I converted your last update to a comment ins$$anonymous$$d of an Answer. To clarify, I didn't say to set it to the ignore physics layer generically, I said to change it to a layer that your Bullet does not interact with. You can set layermasks for this. Does that help?

Oh, i have no idea. I have not looked into different layers. I did not know there could be different layers for physics. Do you have any tip on good tutorial about this?