Guns crack, and another of the bandits falls to the floor. The firefight isn't over yet, though, as two more come running in from the north, looking around in confusion for the source of the attack.
"They're up there, you idiots!" Their leader yells. "Up on the ridge, in the trees!"
As the newcomers take cover, Buzz decides to leave it, lowering himself down the ridge in an attempt to reach Jen. Unfortunately, cliffs aren't his thing; his foot slips and he tumbles to the ground, the wind knocked out of him.
Buzz takes 6 nonlethal damage and is knocked prone (but I assume he uses his remaining action to stand back up? Technically he could still cast Magic Missile from a prone position I suppose)
The bandit leader takes the opportunity to shoot at the daring but unfortunate gunslinger... luckily for Buzz, tumbling into the bushes makes him a hard target to hit, and the bullets bury themselves in the ridge nearby.