Matt is very accustomed to listening to people's heartbeats to tell if they're lying to him, and even before the emojis can be read out loud to him, he can already tell that Caspar really isn't upset about being left in the dark. So to speak. Score one for early honesty?

The bombshell that gets dropped on him does make his eyes go wide, eyebrows raised in startled surprise. There's no moment of doubt that the other man is pulling his leg, because there is absolutely zero change in the rate of his heartbeat. Doubt no, surprise yes. "I honestly wouldn't have guessed that. You sound exactly like a human to me." And smells like one, but people tend to find that part creepy, so Matt decides to keep that to himself for now.