[ He has a natural instinct to protect people, particularly those who are fragile or can't defend themselves. This Zeno seems the opposite of fragile, if his claims are true, and yet...

"Zeno is used to people trying to test it" — even if he doesn't die, won't it still hurt, when he's injured? ]

I won't.

[ A beat. ]

But your secret won't stay safe if you overuse that trick, so beware. Even if you can't be killed, an enemy can take that into consideration. If I encountered an unkillable soldier, I'd trick them into falling into a pit, and bury them alive. That's just off the top of my head, I'm sure I could dream up a lot of other things, too, if that didn't work.