While Angela is confronting Rachael and her parents in the park, the video is reversed for one quick close-up of the gun in her hand. It swaps from her right hand (in most shots) to her left hand (once). The reversal is obvious since the view shows the slide release and ejection port both to be on the wrong sides.
While Angela is confronting Rachael and her parents in the park, the Beretta 92-style pistol she is using has the safety engaged, rendering it harmless. The subsequent discharge, when Rachael is grabbed, could not have happened.
After the 'shot in the air' discharge, as the two men are grappling on the ground, the safety on the hand gun is dis-engaged, as evidenced by the exposed red "danger dot" marking above Rachael's thumb. Since the semi-auto pistol has just been fired, however, the hammer should be in the cocked position, prepared for the next shot, but it is not.