I saw a longsword was in his inventory, so I thought he knew how to use it and so I could do that D: oh dear. I'm sorry again, it seems this battle was flawed from the start.  

I see your attack as a lunge, because of that range. If it is a lunge in gran passata, then I'm confident my counter is the textbook one, because it's been taught/used against me. If it's not a lunge, then I still don't quite understand. 

edit: yeah, there have definitely been imprecisions in my posts. If you want we can restart from zero and I'll do my best to be detailed.