I don't play Talim, but I think I discovered a glitch regarding her BBB. If she cancels into stance immediately, her RE won't parry i10-16 moves even though it looks like the attack is being reflected. But if she holds the RE for even a slight moment, it will work as intended.
Despite the fact I main Talim, I have never used BBB because it's useless, so I have no idea if that's new or not. Her (literally) detrimental aGI that she has on WNF also has a quirk like that, where if she cancels into a move the moment a move makes contact with the aGI, it doesn't put you into the horrible aGI animation but does absorb the attack hitbox, so you can actually punish them as opposed to... twirling backwards. Talim: The only character with a detrimental aGI unless you Just Frame the GI.
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The RE changes are something I am willing to mostly call good, despite maining Talim (Thank god for meter reduction on success -- it's still insanely high though). They certainly hurt her, and doing RE cancels in neutral that do not absorb anything guarantee 19% guard damage. RE as a whole now more or less guarantees that you will have done guard damage to yourself if you use it, which I think is a fine decision for the mechanic. It's used to cover all options, so it makes sense that it doesn't heal guard damage beyond what it used.
That aside, I do think GIs should have stayed the same, or at the least, should be healing guard damage on success still. Guard damage is very, very high in this game, and now the way to avoid it: Going for GIs or RE are now detrimental. RE it makes sense, but GIs should be replenishing your gauge on success.
Right now, if your guard gauge is high, your only solution is to: never block (good luck) and don't get hit while it
slowly very slowly drains, or, the new option which is to... run... at... the... opponent. What!? Why does that reduce guard damage!? It does an mild job of it if you're Sophie or anyone else or makes a habit of running at someone's face and making them guess between launcher/low/horizontal. Otherwise, you're not going to be doing this that much, and odds are if you are and not in an oki situation, you're probably going to have to block something or get smacked for doing it, so sort of a counter-intuitive solution.
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Welcome to guard break land, me thinks.
Personally, I think that GIs should still heal 8% on success and/or that Just Guards should half guard damage taken so that that mechanic actually has a use against someone other than Taki/Geralt and Soul Charge.