"And you decided that mugging was a good way to go about that? Panhandling is likely more within the scope of your abilities, perhaps pickpocketing though that comes with its own risks. Why jump to mugging? Especially when you were blatantly not prepared to do it."

Which referred not simply to the boy's poor choice in weapon but the fact that he clearly didn't have the stomach for it. Quentin had seen how the boy was trembling while he held the knife so he couldn't quite understand it.