[As if aggrieved:] He kept on saying the only way to win was to kill literally everyone! I was only gonna take it for a day to prove him wrong and then give it back. Sooooooo... yeah, he was totally in the middle of it.

[He doesn't sound too repentant about it, though.]

I think he'll be sticking close to you and Koromaru. And you keep an eye on him too, okay? I know using Castor ain't easy for him. You guys can look out for each other.

[...and that's a good way to keep them together, if they're both bonded by a mutual sense of duty.]