If it's moving water, especially if it's fast-moving, then the initial impact wouldn't have been as bad as it would if it were stagnant. That and this is anime.
[hider=Spoiler]
Emmeryn survived a fall that was just a little less distance, and she slammed into solid ground, and only walked away with amnesia.[/hider]
Talbot can survive

EDIT: Also, Why do people misspell "Shepherds" as "Shepards"? It has the word "herds" in there, so we are shepping herds . . . whatever shepping would be. XD