Even under 'high tier' stipulations, I still believe some laws of physics and logic still need to apply. This is still T1, after all. I dont believe high tier is the equivalent of 'do whatever, however, and suffer no consequences'.

Corban fired the sheathe specifically to prepare for a riposte in the event it didn't hit, so he was ready when you fired it off, and could thus react accordingly for the most part. There were also two different units of time used to describe your casting. First is used 'split seconds', which implied more time. Then you stated 'not even a whole second' which implies less. I just decided to go somewhere in between. I also gave several other reasons that Corban would be prepared for the spell.

The diamond barrier wasn't his skin, by the way. It was summoned around him in a 'shell' or oblong shape. I also didn't mean they were literal 'sparks'. They are the stray blasts of energy that managed to escape the aerogel and disjunction.

The aerogel was stated to have been extended beyond its worldly limitations, and graphene-aerogels are slightly denser than base aerogels. So is it an aerogel? Yes. However, it has better performance than any aerogels known today. I also was not aware that the rune of nihil was using gravity as of this point, since last time it came up it wasn't. I know you unlocked the gravity rune, but I was, again, unaware that gravity became a part of the equation(since you had some gravity based runes still in use even before we escalated to high tier). But regardless, id still say Corban gets out of the attack between all the aforementioned facts.

Edit: Also taking Corban's crystal defense into account, damage would be lessened by the crystals ability to resist magic and magic-like attacks/defenses, which would lessen the blow a bit more as well.

Edit: about the rotational energy, yes, the world is spinning and therefore everyone/thing moving, but that energy is not 'connected' in any way other than causality(earth spinning causes movement). To freeze kinetic movement in a small, finite area is nothing like stopping the whole planet from spinning. Even in high tier I never utilize world-busting things like that.