I disagree on this one, personally. For me the key point is that remorhaz neither speak nor understand any language. They are smart animals, but I think they're intended to be more akin to very clever monkeys or dolphins. As far as dropping a victim from a high place and then going to eat the fallen critter, that's not more complicated than what real-world animals do. This is fairly easily observed by owning a cat and keeping its food in a bin on a shelf that can be jarred open by a fall.
That said, I think doing were-remorhaz before doing actual remorhaz is kind of goofy, and were-undead are, frankly, sort of a dumb idea. ("He's only a little bit dead! It's intermittent!")