I really like the way you have framed the two guys, both using the background(s) and the strobe light.
The strobe power on the guy to the right is strong enough to balance the bright background, giving a very nice effect.
The left guy could use some more power, the contrast on his face is too high and the front of the face too dark - so more strobe power would enhance the focus on him.
Going to the extreme in perfection, add a diffuser to bring down the brightness on the right side of the face of the (camera) left guy. I am sure, you would love to carry around a large California Sunswatter panel with associated stands, booms and sand bags
You have a good eye for composition. I briefly believed it was one shot, with the guy on the right being 'around the corner, down a path'. That just shows how strong the focus is on the guys, it took my eyes quite some time before they started focusing on the ground and the right edge of the building, revealing this is clearly two separate shots.
Regards
Michael