There was (an exchange of) 'gunfire' between the gangs. [=they shot guns at each other]
We heard 'gunfire' in the distance.
(..) just beyond that thing! He means the tree. Yeah. Tree! Leave him to me! Say, anyone notice that bright light? Approaching gunfire? Get out. / I can do this. I know this machine. He does. He's a Revhead. You got two left! On him. (..)2015 Mad Max: Fury Road