[Cao Pi chuckles softly as he stays within weapons-distance of Kuai, watching his back and letting him handle the heavy artillery there] I keep a great many of them. But that was nothing - I merely hadn't had a chance yet to test and see if it worked here. Apparently, it does.

[it's not something he's adept with, or uses frequently, but what do you know? They have that in common. Ice buddies indeed]

More than you'd think but you have a point, they may or may not be locking it up tight. At the very least I would hope someone is on lookout to let stragglers in.