How to deal with infinite loops?

[icecream]

was doing a quest challenge and the AI , "Borgborygmos", had Gruul Ragebeast (whenever another of his creatures enters, he fights one of mine). Sprouting Phytohydra arrived for him (whenever it is dealt damage, he can choose to make a token copy of it).

So yeah, he kept choosing to fight one of my creature and making another token copy =/

To make matters worse, the AI has nothing to gain here -- he chose one of my lifelink creatures to fight when I have Archangel of Thune in play, so not only is a loop, but it's progressively worse for him.

So yeah, is it going to stop at like 50 iterations? Or can I kill it somehow? Or do I need to delete the Forge process =(

Edit: I ended up killing the javaw process