What to do: 

Go ahead and work out what you want to have happen with the humans, including any unpleasant moments of violence or epithets or whatever. It's a tense moment, but everyone has a bit of a job to do. Meanwhile, feel free to do dialogue between Beler and some sergeant getting all aggressive and then maybe have a higher officer arrive to override said sergeant, perhaps someone that recognizes Beler, at which point the difficulties clear up.

There is, of course, also the issue of the wounded warg.