"It'd better." They wave the stump around. "It's bad enough I'm normally blind. Now I've got this to deal with? I'm sure the castle is toying with giving me handicaps at this point."

They're a little inattentive to Kotetsu's concern. They'd be more appreciative if these were normal circumstances, but none of this is normal, and this Frisk hadn't even really talked to Kotetsu before now.