This is a fun strat. It doesn’t allow for a level pet, but it shows you what Corporal Hammer looks like when he’s commiting suicide.
We are using the “Never More” ability two times: First on Corporal Hammer, to convince him to kill himself, second, on M-37 to prevent him from casting his annoying Burning-Bomb DoTs.
Once the way is clear, the main work is done by pet #3.
BTW: You can also force M-37 into Suicide-Explode by bringing it under a certain threshold before Never More expires. (Usually 300HP (maybe 250?) or below).