Ok so I have been running around with Legendary Dreadnought and always keep on using Master Blitz whenever it gets fully charged up, however I have noticed that whenever I kill an opponent with the effect of Master Blitz, the duration doesn't reset!
Ran with Legendary Dreadnought a few times before too, the Master Blitz would even take me about 5 minutes duration depending on how many targets I could finish off. Now, it just takes me 50 charges of tactical feats for a 15 second duration of Master Blitz -_-
Decided to switch to fury first while this is still bugged. Already sent a bug report as well. Hope you guys can act on this asap!