Tackling an eligible receiver

[ppaltice]

I am working a 6 man game, where in Alabama, the SJ's initial key is the widest eligible and the HL's initial key(s) are the other eligibles (similar for FJ and LJ on the opposite side). Alabama uses NFHS rules.

Only one eligible receiver (A20) on the side close to me (HL). Receiver is about 2 yards from the sideline. Defender (B13) contacts A20 about 5 yards downfield, forces the receiver OOB, grabs A20's shoulder pads, and tackles the receiver at the restraining line maybe 10 yards down field. The play goes to the opposite side (as does the rest of the players). The ball is passed and intercepted (and the Team B player is downed). B13 tackled A20 prior to the forward pass.

Question 1: Is there a foul on B13 and what is the foul?
Question 2: Which official has A20 and B13?