I squeed at that line. It's like the moment Matt hears Frank's name (heartbeat, he must know Frank's telling the truth) he goes "I shall call him Frank and he shall be mine, and he shall be my Frank". There's just something affectionate in the way he says Frank 10 time in under 5 minutes, Meanwhile Frank's "Red" is more imploring. "You're a pain in my ass, Red. You listen to me, Red. Why don't you understand what I'm trying to do, Red? I'm tired, Red, so tired. I've got your back, Red."

Frank/Matt/Petnames OT3.