To Beanbag or not to beanbag?

[Patton]

Originally posted by Theisey
Had the Stanford play occurred today (lets not have the band out there), there would be bags, hats, jocks, socks, all over the field per mechanic.

Simple example.. A 1/10 @50

A34 runs to the B-40 and tosses a backward pass to A88 who is at the B-42. A88 runs to the B-30 where he is tackled.
During A34's run, A89 blocks below the waist on the B-35.

Where is the spot of enforcement? B-40?, B-30? or the B-35?

I would say this entire action is part of the run and the end of the run is at the B-30. Therefore, using the all-but-one principal, the foul occurred behind the basic spot and the penalty accessed from B-35. That's why I didn't think it would need to be bagged. ???????