He stepped out the door and fired into the air apparently for emphasis (looks to me he kinda tried to make sure there wasn't a low flying plane or something). Upon the discharge, the female apparently moved toward the man aggressively (brave lady) and so he felt threatened and opened fire.
At the end of the day, perhaps the cruelest irony is how right Kirk was!
At the end of the day, perhaps the cruelest irony is how right Kirk was!