Hiltslashes are a different thing. They are near instant and Those should glance. I honestly don't know why they don't. It makes no sense, it is like the sweetspot mechanism is too weak/bugged.
I use hiltslashes defensively mostly. Lets say I went to double swing on paul, and he started to circle me. My second attack would be blocked according to him. Ok... I then start a hiltslash and hit him since getting around me requires touching me.
And a hiltslash requires contact or near contact.
Also paul, you just gave me two free swings on you to block in that scenario :X. I could even kick you if you do that.