avr |
There's ways to shoot around corners. Arcane archers can, IIRC zen archers can too. Aim above the wind wall, have the arrow turn a corner down.
A ballista is a huge heavy crossbow (not large) so use a heavy crossbow and get big enough and you're set.
Use a backup ranged weapon which gets a 30% miss chance rather than being stopped.
Run away or hide until the 1 round/level duration on the wind wall expires.
Bait whoever's behind the wind wall into coming out.