Abnormality Synchronization is quite a wonderful experience.
When synchronizing with the Youmo, Ash feels like he's amidst the raging sea, with dark clouds and violent winds and rains, bobbing up and down, feeling as if he's a doll tossed into a spinning washing machine.
When synchronizing with the Mirror Demon, Ash feels himself sink into a tranquil ocean, with light from the moon or sun filtering gently into the water, enveloping him softly as he slowly descends, letting himself fall into the pitch-black sea bottom.
Throughout, Ash never loses consciousness, clearly aware of his 'true self' in reality. It's as if he's in a lucid dream, unable to change the dream's direction, interfere with his actions, or even conceive the idea of 'interference'; his mind slows to a crawl, merely recording his actions like a camera.
So he isn't awakened by his own atrocities, but by the choking turbid currents of the Deep Sea.
