wind dancer and sorcery ward interaction

I have sorcery ward and wind dancer, whenever I get the sorcery ward,
and the buff for winddancer gains stages, thus increasing my evasion, I
don't have the sorcery ward readjusted, the adjustment only happens
after I take a hit, problem is: I have less defences for the first hit,
so if I'm doing a map, and the first hit I take is a big one, I run the
risk of dying for not having my full defences up, so is this an expected
interaction between the two skills or is this a bug?