As soon as Levi felt everyone on his back, and Serenity confirmed it, Levi compressed his organs inside of his body to make himself lighter. It was painful, and he wouldn't be able to do anything if attacked. But the Mosasaurs wouldn't get the chance to even see him.
Right as the monsters came around the corner, Levi and the others we're already gone..
The current nearly knocked everyone off of Levi as soon as they entered it, it was so strong, but they held on for dear life. Levi helped by forcing his tail up to act as a breaker to the immense rush of the water. It hurt like hell for him, but his friends were safe, and that was all that really mattered to him.
As the world zipped past them, colors mixed and blurred, reminding Serenity of the tunnel that she and Matt used when they had left Oceanus and Tethys' place.. 'Levi had saved us at the end of that as well. I owe that guy-god, so much..'
