The arrow was headed straight for the point in between his shoulder blades.
Atlan had no other choice. The only way he could dodge this attack was to bend his upper body forwards. But because of the uneven terrain of the dark forest, especially the dark 'stream' of water where it sloped down, Atlan would be forced into an unbalanced position.
He would get tipped forwards and eventually end up falling into the stream because of it!
He couldn't think any longer. The Huntsman already let go of the arrow and gave him no time to ponder.
He had to go and step into the dark body of water.
Atlan bent his body forwards, but because of the very thick battle suit, his mobility was limited. He was only able to bend forwards by a little bit, which meant that he wouldn't be able to dodge the arrow fully.
PENG!