Grimrock

i am really not very good at this. I've tried having a look around, but i really have no idea what i am looking for. Could someone explain to me how to create a fireball trap?

Basically, you flip a lever and it shoots a fireball out of a deamon head (at your back)

how would i create one? And would the method be the same to create a Pressure plate that shoots a fireball at you?

This may be useful for tips to make your own.

I'm so stupid, i didn't realize a spawner could spawn fireballs (in 3 sizes no less)