The Marine and his wife should have just left and requested a refund.
That's the answer.
The way of the urban warrior is to make decisions that do not result in being surrounded by a loud, angry mob. The age of the miscreants is immaterial. Once the odds go to 100-to-1, you've done something wrong.
Sorry, but the guy made a bad decision and his wife paid for it. He decided that his $10 ticket entitled him to a distraction-free movie, and he had other patrons ejected from the premises. What did he think was going to happen?
Did he think that these feckless teens were going to gather in the parking lot, grin sheepishly at one another, say "aw, shucks" and head for a soda at the nearest Sonic?
Damn fool could have got himself and his wife killed over the price of a movie ticket. Instead, they should have left the theater, obtained a refund, and done something else that evening.
Now, all that said, let's go to S&T. Maybe it's mistaken identity and you're innocent but have been confused with another couple and you're facing an unruly mob. If you're armed, a shot fired in the air is a viable move.
That's because of crowd logic. A large group milling about is trying to get "closer to the action." When a shot rings out, nobody except the closest will know who fired, but they will know that bullets are now flying around. Expect rapid disbursement. The people fleeing to get away will encourage others to do likewise.
The alternative is to
take your chances.