When you leave PCs or NPCs tied up in a game, they have an annoying tendency to have gotten themselves free by the time you return.

I just saw an episode of Westworld where a protagonist strongly discouraged such behavior in a rather ingenious manner . . . by removing the pin from a grenade, then making the tied-up prisoner hold the grenade's spoon in place by pressing it between his chin and chest!

NOBODY is going to wiggle, bounce or in fact do anything other than remain VERY still, in that sort of situation. 😉