Gabriel doesn't know his son. That shouldn't surprise him anymore, considering that he's investigating whether he's been fighting Adrian on a daily basis, but it still does.
When on Earth did Adrian grow up quite this much?
He's protecting those insufferable fans swarmed below him. Emilie's spirit shines bright through those fearless emerald eyes, and Gabriel knows in that moment that Adrian has what it takes to be Chat, whether he is or not.
Pride rushes through him, bittered by an aftertaste of self-disgust. Emilie would be so proud of their son... and she would loathe what Gabriel has become.