why is my projectile not working?

Help Requests
1

I have a monster that I can kill by hopping on top of, but when I shoot it with a projectile that i programmed into the monster to kill it, it just knocks it back. I have no idea what is going on. look at the code for yourself: http://www.flowlab.io/game/play/969298

2

I don’t know why collision it’s not working. But use the Proximity behavior instead, for now.
It works.

3

I tried the proximity and it didn’t work, the same thing just happened