The tall guy's name's Bertolt, and the short girl's name is Annie. They might be going by something else, though. It's hard to say.

[ The three of them know how to maneuver undercover, but none of them have experienced a situation quite like this. Hence Reiner's decision to introduce himself openly. Better that than letting one of his former comrades do the honors. ]

I've gotta admit, I'm not sure what you mean by "mortals."