This is how I see it happening. Young guy is texting, old guy gets annoyed and confronts young guy, young guy says he is texting his 3 year old daughter to make old guy look like doosh (seriously doubt he was texting 3 year old). Old guy goes to get manager (probably some 20 year old kid). Manager is side- tracked with other crap and tells old guy yeah, yeah I'll be there in a minute. Old guy returns to theater (had gun on him at all times didn't go get it). Young guy probably said something smart to old guy. Old guy is already thinking (what am I going to do I've called this guy out he won't listen and he is thirty years younger than me). Old guy gets super frustrated, snaps and pulls his gun. Young woman puts hand on husbands chest to try and steer him away from confrontation (not throws her hand up to stop/catch bullet). Young guy says what are you going to do shoot me, and old guy pulls trigger.
about it.