Carpenter had a timely realization, and Hill of course noticed it, but he was more aware that the girl truly didn't touch his heart, or rather, was not suitable to be taught by him at all.
How to put it... He is actually a very self-centered person, and part of his cognition is, from a human perspective, somewhat odd.
Even though he occasionally thinks about putting oneself in others' shoes, placing his feelings in a lower perspective to ponder, that's only occasional, and his low doesn't seem to be truly low.
This is also the reason he never denies his Earth Bear side.
Hill genuinely couldn't consider whether there might be a small branch that would fall if bumped in the places he passed by, nor would he consider if there were any small stones under his feet that he might step on… because those things would naturally avoid him.
He didn't even need to use brute force to crash through.
