Miyuki's cocytus is a mental magic that freezes the soul/mind.
They offscreened Tats restore, their injuries/bodies should have looked like they were being rewinded.
Tats face didn't change at all when he used regrowth, he looked perfectly fine. He was even smiling. He was supposed to have just felt a metric shit ton of pain. There should have been wincing at the very least, I would have even accepted a poker face, but a smile? Just no.
Before Regrowths explanation, they simply asked if it was Healing Magic, instead of breaking the silence by asking how long they have until the injury reappears without additional recasts.
Ichihara never got held hostage at knifepoint, only to subdue the perpetrator by using magic without her cad.
They didn't explain how Mayumi's Icicle Drop forces CO2 into the lungs causing the white tiger to pass out.
etc