What to call

[JugglingReferee]

Originally Posted by LI Ref

Two scenarios - Ball carrier is on the 5 yd line when offense clips defender on the 35. Block in back / spot of foul - PF / suceeding spot OR USC / Suceeding spot.
#2 - Ball carrier on the 25 same foul as above - Thanks

There is definitely a foul here. The type of foul is in the judgment of the covering official. After seeing the hit, the official should locate the ball,then throw the flag.

If the hit has nothing to do with the play, it is UR. If the block could be constued as a tactical hit for blocking purposes, it is blocking from the rear.

UR: 15y from PBH, convert, resulting KO, induced KO (if last play of half), next quarter (if last play of quarter), or OT (if last play of game).

BFR: 15y from PBH.

Bottom line: ref decides - it's why we get paid and what we learn from studying.