Of course, the reason it couldn't be destroyed wasn't because the enemy's attack lacked strength, but because they couldn't utilize their power effectively. Take a block of hardwood, for example. If it's propped up properly, even an ordinary person can kick and break it. But try to split it midair, and there are few in the world who could manage that feat, aren't there?
With a strong defense in place, to shatter that defense one not only needs a powerful attack but also to apply force effectively. If the force isn't applied correctly, it's like swatting at flies with a fan: you can send the flies flying but you can't swat them dead.
