Illegal Fowrad Pass or Not?

[JMN]

Same play plus... After receiving the handoff from the QB (A1), the RB (A2) throws a legal forward pass downfield to A3.

A3 catches the ball and to avoid tacklers, runs laterally across the field. As he approaches the sideline and is initially hit, he hands the ball forward to A4 who is in front of him due to a poor block on B24. A3 does this to avoid ending the play and avoid going out of bounds. A4 runs the ball into the end zone for a touchdown.

Anything??