Seeing Clark rush toward the gluttonous imp made Isa want to slap him. It was reckless and he could do so many more things. She was sure that they could just slowly wear this mess of a beast down if they were to take their time. It was clearly slow and would be unable to follow them to the first floor. But he was attacking anyways.
Clark on the other hand felt that he had no choice. Wearing away at a beast that had eaten itself in to a flabby armor would be tough. The gluttonous imp could easily resist the physical and magical attacks from him and Isa. By the system had given him a clear way to beat it and he could do that.
and now its a puddle...ew