With Aganos, you can do shadow rocks, then during the rocks, you take a chunk, put a wall behind your opponent, and ruin them through it. Shadow ruin is unbreakable (it counts as a shadow ender), but regular ruin is just a special move link that doesn’t trigger “ender” until the wall crash, which means it’s breakable.
I tried counter breaking the ruin as Aganos, and weird things happen. First, you get the counter breaker sound, but no animation plays… Aganos just punches right on through the wall anyway. But more importantly, no counter breaker plays at all even if the opponent tries to break. What’s more, if and only if Aganos tries to counter break the ruin, all strengths of breaker will successfully break the ruin, no matter the strength Aganos used.
It’s… kind of the opposite of a safe counter breaker. It’s a counter breaker that doesn’t work and also turns all break attempts to successes. So it’s… a fail counter breaker? lol
If you’re playing against a human player and you aren’t able to break literally the 1st frame possible, you will successfully break but then crash through the wall anyway (I’m sure the team knows about this one but it’s probably really hard to fix).
More on this here: Rate YOUR most difficult MUs vs Aganos, in order - #34 by Infilament