Although you regret the course you have to take, you know necessity when you see it; if you're not able to finish them and still handle their boss, everything you've done was for naught. You attack the one nearest you, crushing his bones and puncturing organs with your strike. He's defeated, but something's not right; he's started ticking. The ensuing explosion removes one limb and burns you badly. You could keep fighting, maybe even win this battle, but that explosion kills another, who also self-destructs. In a moment, the warehouse is hell, full of noise and heat and death, yours in particular.