Into the Frey is stuck and unusable (already activated)

Description:

Eder ,the fighter, can't use the ability Into the Frey. The ability tooltip shows "Already activated". This is permanent, in or out of combat.
Rest, client restart, removed from party did not fix the problem. This is save specific, once it occurs it will affect all new saves files.
The only fix i found is to use a prior save not affected by the issue. (i lost progress once i discovered the issue was present over 1h or gametime played)

Important Files:
Added save file before and after and screenshot

Your upload limit prevents me to upload the files, please advice how i can give you the save files.

Screenshot

http://steamcommunity.com/sharedfiles/filedetails/?id=415938187

Steps to Reproduce the Issue:

Not verified, but i belive the fight ended while the ability was casted, maybe the char had a pathfinding issue while trying the use at ability and the fight ended before activated. (Already activated")