In Guilty Gear XX (this is the japanese version here, not sure if it matters) there’s a bit of a training mode bug with the training dummy’s Guard option.
Setting it to First will make them block the first attack you throw at it, which makes sense. What does NOT make sense is that they will block said attack regardless of what they were doing, in this case in the middle of Dizzy’s super.
Hitting the player at this point allows them to move around and attack as normal, albeit in the form of a massize iron coffin. You can still do instakills, too!