Honestly, especially in Duels, you can't complain if you get thrown off a cliff.
It's a real and used strategy. You should expect that Block Break to be done against you, and you should counter in turn.
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Absolutely. There is even an indication when your opponent is going to guard break you.
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Exactly. It's a split second warning, but it's something that you definitely have to expect due to where you are in your surroundings.