[Though Sephiroth is scanning with his eyes in the gloom and slowly progressing with the soldiers providing back up and his katana drawn, he keeps his hearing sharp enough to listen well to the others. They all have plausible theories but it's as Ace said, they're running in blind here...]

To that end, it might help to try and get some extra lighting in here.

[Not only because wielding a torch in one hand and a katana in the other could cause a slight problem should they encounter whatever creature ripped the place to shreds like this.]

At the very least, bring something up from the camp?

[Two of the soldiers who had stayed back by the doorway stood to attention as if expecting the order already, though Sephiroth hasn't yet executed it.]