After Fives becomes convinced that, like Tup, there's a chip inside his own head, he tells AZ, "You have to take it out." AZ is hesitant and tells Fives that it's a "dangerous surgery" and "you may die," but Fives replies, "It's a chance I have to take. I trust you." Before finally agreeing, AZ's mouth lights up without his saying anything and stays lit for a few seconds. This is the droid equivalent of his mouth hanging open in surprise.