Openkore.com

Hi there,
Yesterday I tried for a few hours on a problem I can't solve.
I want my kore to use a flywing when Swordfish is casting waterball on me.

I used stuff like this:

useSelf_item Fly Wing {
onAction WZ_WATERBALL
inLockOnly 1
}

It might be a pretty easy problem to fix, but I can't do it...