A trap triggering problem

[temnix]

I want to make a trap that activates when a creature walks over it instead of appearing half a screen away. This requires a very small Trap size value - around 30, I think. But the trap does not always discharge and disappear after triggering. Sometimes the monster can get hit by it several times before it vanishes at last. Is this something that can be fixed or worked around?

P. S. Never mind, I figured it out.

 

Edited June 10, 2021 by temnix