When your senses are blurred, you can attempt to do weapon skills that your proficient in.. but don't have the appropriate weapon wielded. For example:

Bard A blurs Warriors A sense
Warrior A is wielding two axes
Warrior A attempts to boneshatter
Warrior A then gets the message that he tries to 'hit some empty air'
Warrior A is lagged for the skill round

This is based on where the checks are made for When you don't see me, and where it is now, prevents having the same code in every single skill function. I don't see this changing.