While part of Merlin wants to protest this hasty decision and point out that a search of the cave before jumping down the throat would be the pragmatic thing to do, there doesn't appear to be much of anything up here and it's obvious where all the players in this memory are focusing. So. Down the hatch.

He follows Armani, but stops when he sees how the other boy's foot sinks in with the first step. That's doesn't seem right. "Gotta dock points for inaccuracy," he remarks, tone dry but also a bit tense.