Looks like someone bit off more they could chew with Onyx and they're attempting to flee. Onyx, of course, if having none of that and bears down on the runner, ready to use the shotgun and clothesline them with it.

An interesting image I got from  Gigren He did his own take on Onyx's modern clothes and I have to say, I quite like it. I've been wanting to get more use out of his non-fantasy gear and thanks to  Gigren we have one image thus far!

Art by  Gigren