It was really simple work to slip off that knot, Gen wasn't even aware he was doing it. Normally he'd apologize for Senku hitting his head, a more reflexive amount of politeness than one he thought the scientist was even expecting. He's just too distracted.

"Hell of a thing to forget to mention," Gen murmured quietly, turning the device around in his fingers. He shuddered a little. "It had occurred to you, my dear, that if both you and I suddenly get kidnapped by this train - others might as well?"