(Ah, true. I wasn't sure exactly how far away you were. I just knew you were keeping your distance but not quite how far.)
You are able to get across the shattering bridge just before it collapses into the lava. The incubi seem to have forgotten about you at the moment as they stare with a paired amazement and confusion at the otherwise incredibly rampant destruction they are seeing. The two demons exchange glances before they begin their ascent towards the top of the volcano. Knowing better than to take on whatever this is by themselves, it's obvious that they're going for back-up.