No, what concerned him was the dark surface. It might mean deep water.
It might mean shallow water with a dark bottom.
Even deep water could have jagged rocks, old tree trunks, any manner of solid sharp debris.
If you have no choice but to go in, it doesn’t matter whether the water is deep or shallow, or so he told himself. What matters is that you go in feet first. An injury to one or both legs could be survived. Head injuries, out here in the middle of nowhere, probably not.
The first arrow hit the dirt close enough behind him that he heard it, felt a tiny shock in his feet. They would wait until they were close enough before loosing any more.
And as he went over the edge feet first, one foot snagged in the tangle of a tree root sticking out, flipping him completely, holding for less than an instant before he dropped again.