A BB gun has to be used very intentionally to hurt your eyes. A high-powered laser could blind you because your neighbor is doing some work on his shed and you caught a reflection
In this example, crossfire would require someone to walk into an airsoft combat area without any eye protection and for someone in that game to not realise and shoot them anyway. In the face.
Stray BB bullets don't go very far. They're not rifled, and they have fairly low muzzle energy compared to real weapons — I've shot myself with one at zero range, and even on bare skin it stings rather than penetrates.