When your partner smashes, your own position still matters. A common mistake is to stop and watch the smash instead of preparing for what happens if the ball comes back.
Your partner has committed forward and may have opened space. Your job is to cover that space and stay connected so the pair is ready for the next shot.
What to do
Move into a balanced support position rather than copying your partner's movement. The exact spot changes with the smash and the opponents, but the principle stays the same: protect the gap your partner has created.
This is especially important when the smash does not finish the point. Good opponents can block, lob or defend the ball back, and the support player often has to handle that next contact.
Why it works
Treat the smash as part of a sequence, not as the end of the rally. Partner attacks, you cover, then both players recover into the next shape.
That keeps the attacking pair compact and stops one aggressive shot from turning into an easy counterattack.