I haven't had a close call. But being surrounded by criminals while working as a correctional officer had me in harm's way 8 hrs a day.
They are both there to stop you escaping. (That's why they stand by the doors when you are boarding). I did try to start an escape tunnel once, behind row 14 on a Virgin Atlantic 747, but I was discovered and plied with cheap champagne to persuade me to stop.
The price of your ticket. lol.
They are the same, just one's a more fancy term.