Why? It's incapacitated the potential targets. Let the drone shoot, the shooter need not worry if they are immune to it's effects.

Little Billy took a wrong turn, though. He slipped on the spray that settled on the ground. The ambient spray in the air has drifted into his eyes. Now he can't see, doesn't know which way to crawl. His panic and pain will be short lived, as the shooter no longer needs to aim, as his target is unable to flee.