He doesn't react when he hears the name of Kanda. He had that conversation. In spite of their differences, and of their clashing morals, they both cared for Ami. He was not sure if more would need to be spoken.

That being said, his helmet jerks at Ami as soon as she asks him something she really could have found someone wiser for.

He knew of the four loves: He felt storge towards Ami and his Spartans, philia towards Lasky and Johnson (rest his soul)... and agape, sometimes eros towards Cortana. It was possible Ami meant that -- agape.

For a moment, John stays silent, thankful of the expression hidden inside of his helmet, before he processes an answer.

"You'll know if you felt that."