If there is a way to block master-strikes other than not triggering them by shift-walking, PLEASE prove me wrong.
I think the idea of fighting the high-level guys is to get into the parry-strike-counterparry-counterstrike loop, resembling real sword exchanges. No idea though what determines who ultimately lands a successful hit. You'd think the AI would be able to perfectly chain the parries forever. They have to have some sort of fail check.
The problem is that there doesn't seem to be a counterparry. My understanding is that master strike is free unblockable attack that triggers a % of the time based on defense skill.
I just fought four guys in a higher level bandit camp at the same time. Killed the two lighter-armed ones so it was just a warhammer+shield guy and a longsword guy, both in heavy armor. EVERY time I swung at the warhammer guy he got a free masterstrike on me, even though I had a longsword and it seemed like I should have been attacking from outside his reach. Couldn't wait for him to attack me so that I could masterstrike him because there were two of them, so I had to keep backpedalling.
I'm trying to figure this out too, and I'm also constantly getting master-stroked by Bernard. Sometimes he parried, riposted, I parried back, riposted only to be master stroked back with apparently no recourse.
I wonder if the effectiveness of master strokes are determined by the difference in weapon skills, and if a higher level enemy is always going to be able to do it. I'm hoping that this is not the case and there's some way to counter these master strokes, otherwise these are just eye-candy animations that somewhat break the system. The parry/strike loops and combos should be sufficient for an interesting combat system, and if the skill differential effectively determines the outcome, rather than making encounters easier or harder, well, then there's no point in an action based combat system to begin with.
I really don't know if this is the case, I hope I'm proven wrong about this. There's a lot of stuff I'm enjoying in the game, but I was really looking forward to a competent first person sword system.