I'm not one to rant, and I understand everything is counterable either by prediction or by reaction.
However, in this matchup, no matter how many times you try, you just can't block the Valkyrie's light attacks as the Lawbringer even tho you change it the very milisecon you see the indicator.
As a side note, as a Valkyrie player, alot of people do not stand a chance against her.
Even pre-patch (1.03) I managed to make around 70% winrate, now it's just a sloughter.
Any other character you play as against a Valkyrie, can block her on reaction, stop her combo, dodge the second sweep and even parry.
However, she will be very punishing if she does manages to get you into her "vortex", despite dealing and already absurd amount of damage on its initial combo.
TLDR:
Lawbringer is just dead meat against her since he is unable to block her follow up attacks on reaction. Even a PK is a better matchup.
I believe that the Valkyrie needs a tune down to her follow ups, as they are extremly punishing and unbalanced.
I know a buff will be coming to the Law, but in general, the Valkyrie is just frustrating to fight and a faceroll to play.