I know where Isaac is coming from, and I don't think it's lag either. I put on the ring and was summoned into to forest to (as usual) fight someone I have no business fighting. There was no lag, or skipping, or jumping around: everything was very smooth.
I pretty much gave up the fight and just stood there with my shield up; buddy does the same so we're essentially just touching shields like we're playing a game chicken. Next thing I know he's got me in the backstab animation. No circling around me at
all. Not saying it couldn't be lag, but it's pretty suspicious that the only time the "lag" would occur is when you're standing shield-to-shield with some. I wouldn't be surprised at all if someone's dex is high enough that the AOE of the "grab" for the
backstab range is ridiculously high.