Penalty enforcement

[Forksref]

There always seem to be some inequities to be found. Correct me if I am wrong, but in NCAA, let's say the QB is chased 15 yds behind the LOS and a lineman is flagged for holding at that spot. Will the foul be enforced from the previous LOS (only 10 yds lost)? That doesn't seem equitable.

I think the overall concept in FED is that yardage gained legally (prior to the spot on the field where there is a foul) shall be retained. Example: end of run = A40 and a hold is flagged at A35, therefore enforce from the 35 because yardage gained up to the 35 was gained "cleanly."

Last night we had 2 holding fouls on the offense that were enforced from the end of the run, which I think is a little unusual. The holds were beyond the end of the runs. In this case the concept is the ball was never advanced that far so why give the offense the benefit of those yards before marking off the foul?

Offsetting fouls seem inequitable sometimes too.