His words landed, and all the great masters around got speechless. They couldn't help but turn their eyes around, looking at all the devastation William caused by his technique, all the dead monsters around, and the wounded masters who didn't know what to say.
They wanted to shout at this youngster: Are you blind? Is all this, not enough? But with a silent gaze from Sloth, they all went into silence, didn't say anything.
Sloth felt the urge William had. He watched this youngster for long enough to know he wasn't delusional or some lunatic who was obsessed with perfection or something.
He knew William was aware of the current might of his technique. And if he said it wasn't enough in an indirect way, then it meant there must be a good reason for him to say so. And they had to endure the upcoming deadly scale of techniques William was going to unleash.