Both at the back, together
When the other pair holds the net, the usual advice is for both of you to defend from the back together, side by side, a couple of metres in front of the back glass.
Step 1
They are at the net, so you both stay back, side by side, a little in front of the back glass.
Step 2
Their volley goes deep. You let it come off the glass and play it back from there.
Step 3
A good lob over them lets you both move forward together and try to take the net.