I'm safe here, at least.
Is this even possible to attempt without a phantom to block one of the archer's arrows for you?
As if they weren't hard enough to kill, I've been trying to hit them with poison arrows while dodging their arrows. I noticed something. Their arrows don't travel in a straight line. In mid flight, they re-allign to where ever you happen to be standing, making it possible for these ridiculous knights to shoot almost clean around a corner.
Try it for yourself, and watch the broken flight path with amusement just before you get knocked back 10 meters on the platform you're standing on.
Anyway. I think I'm about to go up there. Pray for me.