Isaac doesn't bother arguing; he's said all he can and there's no point in repeating himself when he and Stiles clearly don't see eye-to-eye on the topic.

At Stiles' next question, Isaac falters, realizing his slip up and his eyes go wide as he gapes. He could lie, tell him he meant they, that they as a pack had cared, but there was no point when Stiles would be able to detect the lie.

"I--I... I mean... I... Stiles, I..." What was he meant to say?