Good night, fellas

Today I have an unusual request..

I'm training skills with creatures, but there is 3 SQM around me (and I just want 2 monsters hitting me of course).
I need an action to put one fire field next to me if a Stone Golem appears (so it cannot attack me).

Like this:
[wall] [monster] [FREE SQM]
[wall] [me] [wall]
[wall] [monster] [wall]

That FREE SQM is messing with my skill training

Is that possible?