Tips to Survive the Swamp Monster
You stop moving.
The monster moves randomly, if its a bit away, you move but stop.
No rush anyway, Charles cant get you.
When i did it, i catched the fish, then jumped back into water (i didnt see the monster before because its just some water puddling around), noticed it was a metre from me so i stopped.
It then moved away a bit, so i moved forward whereas it turned back and headed to my position, so i stopped.
It came close, then went away a bit again, rince repeat.
At some points, it was even directly on my position several times.
But as long as you dont move, it cant do anything apparently.
I had Charles start a hunt 3 times during that section (because i needed like 6 or so minutes to get back to the other side) and he didnt come to me but was moving around the lake, not through it.
So i assumed he cant.