I'll disagree. The passer is getting credit for one passing attempt/completion, then only one reciever can get credit for the one reception. Since the lateral had to be "thrown" behind to be legal(can't make a second "forward" pass), then the rusher who recieved the lateral is credited for 15 yds rushing. Difference being if the lateral is fumbled or missed, live ball. If a forward pass is missed, dead ball.
So,
QB credit one passing attempt, one completion, 15yds.
Receiver 1 one pass reception, 15yds.
Receiver 2 one rushing attempt, 15yds.
IMHO