pretty easy
basicly it blocks everything doesnt matter how much you feint, or half block your swing than change direction, so every "hacker" will block everything you do, but, if you outspam him when he attack you, it doesnt work. is the only way for kill him.
and tbh, i finded even too much ppl with that ability to "block" even 500 of my swings in duel server, but suddently die outspammed while they where tryng to swing, becouse when they try to swing they "release the defend button so hack not work anymore"
another trick is , hold your swing, than change direction, 90% of good manual blocker, parry than release, so a holded swing tricks them, the hack no.
(for hold swing i mean, attack head for example but not release, the good manual blocker player, will parry it, than release it, than you release and bam you hit, the hack never do that, he continue follow your directions )
i was in clanbase as admin /judge for aimbotters/wallhackers,scripters ,speedhackers etc (day of defeat-counterstrike section) and tbh this "hack" since is unfallible and very precise, is very easy to detect, today i have seen 2 guy using it, and as soon i writed, "turn it off. " suddently theyr k/d ratio dropped by a bit.
very easy to spot a player who use it, expecial when he have 2-3 enemy near, and the "hack" fail to judge the attacks, so he parry the swing of the guy 5mt faar away instead the guy near, or with lightining speed he parry 2-3 ppl in 0,3 second in 3 different direction :O
this is what i noticed playng against this hack, i cant test it by myself becouse not work on non-steam warband, or at list on mine installation. sad part is that probably many ppl will use it during big battles where not many will notice it.
dunno the community but i am a bit nerd in crpg and know majority of players, so i notice very easy an "increment" of the ability to block. expecial if happens in 2-3 day only., so use it in front of me and i will fraps you. and put a comparative fraps of my test.
i am happy i am a 1hander i can see since now the shitstorm about hacking that is incoming..