On a side note has anyone found out why the medic spawns, is it shots fired or time. I went through a few runs and found that the medic first spawned between 25-30 shots onto the bot however can't find an exact number. If the glitch isn't reputable it would be time saving to be able to chose where the boy explodes to get maximum damage.

Had the same thing happen to me, no idea why, kept shooting him and he just didn't heal or move