you have no idea how abusive this isYou're right, my bad. This is how you get into stance from RE
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The transition from AG to Prep happens as quickly as you can input it. If you pressed forward on frame 1 of Arriere Gambit's back step, you'd go to Prep immediately. In this case cause he's back turned after Taki walks around the 2nd 4B+G is actually a 6B+G. So 6B+G during AG is Prep RE. Basically performed instant prep by dumb luck. It's all technically working correctly though. Instant Prep is something they've balanced his combo damage around, and RE will always reorient anyone back to facing their opponent.
So how can you deal with it? I suppose with your current plan of attack you could continue your walk slightly longer cause he can't delay the prep version of RE, and it's pretty linear if it hasn't absorbed any hits.
the RE has tracking so i can't just step and punish i have to wait till he releases the RE
then you have to deal with the reset will he reset it or not? if he resets and you did a fast attack that doesn't GB you'll get screwed, if he reset and you do a GB he gets screwed if he doesn't reset and you do a GB he'll block normally and unpunished
just look at this
its VERY abusive and hard to deal with specially online