when im in bh ill hit them to pretty low health and when i go to spec the spec bar lights up and i get the message that says the spec will be wasted blah blah blah...
To be honest, I had the EXACT same problem when I was trying to use a granite maul. I would always try to rush with it right? I'd click the spec BEFORE I atted the person and I'd run up to them and it wouldn't spec. I got the same message as you did down in the chat, and I overall just got frustrated with it. The granite maul is really cool for the KO, but in my opinion it's just too hard to perfect. I see you got it down now, but what I did was I just got 60 attack and got my d-scimmy and a dds, specing with dds seems much easier, just need to be able to switch and time it right. I hope I helped