Bug got me stuck in Kozney's castle 3rd floor

I can't get over the 2nd bubbles in that floor.
The guides say to cast 'disarm' 2 times on them but as I can cast it as much as I want, nothing happens.
Did I forget anything or is it a bug?
The guides say to cast 'disarm' 2 times on them but as I can cast it as much as I want, nothing happens.
Did I forget anything or is it a bug?