Smiling and an expression of amusement. That seems more reasonable. Normal, he thinks. Though he doesn't return the sentiment, it seems, Ultra Magnus does tilt his head slightly.

"You're welcome."

Magnus seems to hesitate slightly on the subject of Fortress Maximus. Then, he confirms with, "He is. Max is just. ... Lost. I don't think I'm the right mech to help him find his way back, but I am trying."

Garrus-9, the Wreckers, Max, Overlord -- all of it is a delicate topic to many. Magnus hadn't been there.

Though he knows he probably should have been.