Whoops, sorry, it is forward handing. At least I had the forward part right.
Fortunatley, despite my gaffe, the rule still applies.
Vt, the others are correct. Only Team A and B remain consistent throughout the down.
There are probably some case plays to this effect but I don't have access to a book now.
Force is only one way a safety may be awarded. The offense committing a foul that is enforced from their endzone is another.
Ponder this simpler play.
Team B intercepts a forward pass at their 5 yard line and the runner is downed at the B-10.
During the return, B32 clips A20 in Team B's endzone. What do you have?