Well push away, because he's fighting this one like something important is at stake, grip only tightening as a result of the attempt to withdraw. What Shin says does reverberate in his mind violently, bringing up those memories.. which weren't awful, but it sounds like he's trying to take a hit at himself and Roxas here.

With a frown, not meeting that cold stare with one like it but instead of stubbornness, "No.. you know what will happen. You can't be that selfish?"

..can he?