All schoolmen, including the cish, die in exactly the same way when hit with a chorae. check the chorae thread, its all in there. Confirmation bias makes people think otherwise, but the words are all the same. There are always individual differences between schoolmen of all schools, but no one description is entirely unique to one school over another.
Moe does things with the Water that had never been done.
Name a single thing that we know he has done that no one else has using the psuke.
We know so little about it, the mystery is what tricks some into thinking he's special, rather than any real evidence.
Anybody ever work out how he was able to fend off the skin spies so easily?
Serwë assailed him first, her limbs and blade a whirring blur. But he stopped her with blue-flashing hands, swatted aside her slender figure …
Just as her brother descended, slashing at impossible palms, spinning and kicking, lunging and probing—only to be seized about the throat, to gape and thrash as the blind man lifted him off his feet, to blister and burn as blue light consumed his head, made a candle of his body. The thing’s face cramped open and the blind man threw him slack to the ground.
Doesn't sound like weak in the water. Maybe the weeping blood signals that Moe has mastered his passions?
Disagree. Who else do we know uses magic to enhance physical ability? Oh right, Inrau, who
doesn't even know the gnosis. At best, its a party trick. And lighting a fire? I imagine thats sorcery 101 wherever you end up.
Recall that Moe has been hunting, killing, and studying the spies for decades. He knows how to dispatch them, knows the measure of their strength, speed, flexibility, and the rigidity of their thought structure. He likely doesn't need water at all for the task, its just convenient to use the cantrips he knows to move things along.
What you see there is dunyain ability enhanced with the merest fraction of cishaurim magics. In short, exactly as described, a dunyain weak in the water.