As quickly as possible. Well. More or less. With so many of them and varying skill levels, they shouldn't hasten their pace too much, or they may end up with more trouble ahead.

"Nice and steady... Too fast and you'll lose control, too slow and you'll overthink it. Just... keep moving at an even pace." Kain takes care with every foot and hand hold that he finds, not wanting a repeat of that last incident. It's easy to save himself, to know what to do, but the added concern about the others has brought a whole new dimension to this situation. He's trying to remain aware of their positions as he keeps on gradually descending.