Barry is distracted as Derek comes forward, listening to a hum that grows louder and louder. It's something familiar, something like a hummingbird, and Barry's eyes widen. He's hearing Derek's heart! With his own two ears! And maybe also sort of Derek's ears.

"This is crazy," Barry exhales, watching in morbid fascination as a claw pops out of his index finger. "Kind of gross? Not on you, but it's weird on me! Eugh!" Barry jumps and clutches at his mouth. "It's sharp everywhere!"