A rush of lightness came over him like a heavy load had been lifted off of his shoulders. He was surprised because he did not think that the water he had just been in was that dense. He could not control his posture like he easily could while he was talking to Aapep.
It dawned on him, he was now in normal water and he could feel the force that pushed him violently along the river bed. He chocked. He had not prepared himself for the sudden change. He could breathe in Aapep's pool but he could not breathe in the water he was now in.
He had made the mistake of trying to breathe like he had normally done and the water entered his lungs.
He coughed in the water as he choked, which also made him lose more air in his lungs. As he violently rolled in the water, his emotions flared because of the suddenness of it all, angry at the fact that Aapep did not warn him of what was going to happen.