[It's clear from his expression -- however little of it is visible above the mask and behind the veil -- that he doesn't really want to talk about where he got the device, either.]

It is unrelated to the more pressing matter, but let's just say I was coerced into opening a door by a man with a sword, and he thought it charitable to give me a small percentage of what was behind it. I am not a thief by nature, but I saw no reason to leave him all the spoils, as I have no doubt he's up to no good with them.

[Not that a 'personal force field' sounds dangerous, but who knows what creativity lies behind the terrifying mask that fellow wore.]