[BUG] Throwing Knives unthrowable

I looted a Goodie location and found Throwing Daggers - lets the Hero throw daggers at enemies up to 3 squares away.  

So I equipped it (Icon turned green) with my champion but during combat there's no skill / ability button to throw daggers.

I tried it on my other champions as well to no avail.  

Then an air elemental ate my party    (those may say 'weak' in the status but don't believe it)