William got what happened, the monster crushed the shield and then instantly returned back inside to heal. It knew the shield was going to reform, and that shield was its life saviour now.
As for the bear monster, it was inside that giant thing lying down below. "Gather up everyone," William seriously said, "we are going to repeat what we did."
"Again?!!" Everyone looked at William as if they were looking at a madman, "can't you see? This isn't something we can come close to! We need to retreat…"
"This is just an outer shell," William interrupted one of the old masters' words, "and the real monster is huge indeed, but it isn't that colossal. So gather up everyone, we are going to do it again and again until it gets severely damaged."
"And then what? Won't we kill it?" another master said, and William looked at Sloth as if he was telling him that such little tricks wouldn't work on him.