couple situations to check on

[dshauver]

I'll try to simplify for you reflinks....
-If the jump set by the back row setter, on or in front of the attack line with the ball above the height of the net at time of set, crosses the net, that is a Back Row Attack.
-If that same jump set is then followed by contact by another player on their team to complete the attack, that is legal, as long as the attacker is a front row player.
Keep in mind who it is that completes the attack.
*The Libero setting can make things more complicated, but I wont mention in this post as that does not apply with your situation.
***From the Case Book:
9.5.4 SITUATION A:
The RB on Team R, while positioned in front of the attack line, attempts to contact the ball. At the point of contact, RB and the ball are higher than the net. The RB a) directs the ball toward a teammate; b) uses a fist in an attempt to save the ball but accidently directs the ball toward the opponent.
RULING: a) legal and play continues; b) illegal.
COMMENT: A back-row player cannot complete an attack while above the net.

Does that help you out?