Well, you do have an archer that dealt out 115 the previous round. And Daylily can lay the smack down well. If the prone red demon with 4 hp left between Daylily and Borric is killed, Borric can withdraw through friendlies and face only one significant AoO. The red demons need a nat20 to hit Borric. A short sword in the gut doing 1d6+10 is going to be a gamble, but is possible. Even if he drops from that, the demons are going to go full round attacks on the standing opponents first instead of finishing off a bleeding out man. So a next round channel would be able to stand you back on your feet.
So, the fight is survivable. It may be a rotating lead person taking hits and withdraws while a cleric in back channels, but then, you haven't seen the demons bring a healer for their side yet.
Yes, the black ones are nasty compared to the meager red ones.
Since the one Arianna is facing got its sight back, she is going to be in the same situation soon.