[Alberta's Child]

Any defensive penalty would have been offset by the illegal man down field, play dead, no time left on the clock, game over.

I'd have to see a reference to a specific rule on that. Someone else here thinks that the game cannot end on offsetting penalties.

[Mrs.Liberty]

see my 175 link. The game would not have been over on the offsetting penalties (and no time on the clock). The Giants would have gotten one more play, untimed.