First of all, every net player should try to retrieve their lob. But if the lob is successful (clears the net player), then it will be the baseline
player’s job (if he is in position) to retrieve it.
Important:
What should the net player do if the ball goes over his head and on his side of the court?
Answer: As the baseline player is moving to return the lob, the net player should switch sides and move back joining his partner at the baseline. Why? Well… Most of the time when the baseline player returns a lob, he chooses to lob it back. And sometimes the return lob is a short one… that puts the opposing net player in a perfect position to “whack” the ball right at the closest opponent. That makes the net player’s moving back a perfect solution. (see graphic below)

OBP = opposing baseline player
ONP = opposing net player
NP = net player
BP = baseline player