Too bad Curufin doesn't have any of his explosives here! That would simplify a problem.

"Hmm, I hadn't thought of that. The train's entry into this universe and onto this planet might have jarred the ocean and the land in some arcane manner. Maybe that's what brought the crustaceans out. But, yes, keeping them off the mer people is just a way of preventing a worse misfortune than merely the whole city falling asleep. Let's get back to it, shall we?"

The wave of crabs reaches them.