...but it's sufficiently obvious that this is actually 'yes' that he only thinks those thoughts momentarily and in a fraction of his mind before the greater part of himself plunges down to Yaisa's neck and bites hard.
(Keltham is not, at this point in time, thinking that second-circle wizard students are any easier to injure than third-circle Worldwound veterans; he's just thinking he's in a universe of absurd masochists who happen to be absurdly resilient.)