To be fair, you could do the second grenade jump on the little platform on the left if you want to be a pacifist (ez 0% strat) :P From my experience it's pretty random whether you kill a guy on the middle platform or not, but most of the time they do perform an die

I'm not going to lie, my wrists are killing me I need to stop. My head however can see that I can easily still shave off time if I hit just the right angles and perfect that start.