Fights Burst does not work, it should be usable while blocking.

[Annie enjoyer]

I dont really get how it works, so i just smash it when i need to stop a combo.
But a problem with blocking is the forced auto block, sometimes you need stop blocking but you cant.

 

[Iam N]

You cannot stop blocking until the enemy finish their combo, this is called sticky block and SGM is designed that way.