Look at the screen: there is two isolated shallow water points where you can bring animal, and kill them at safe distance.
Animal can jump to this points, but cannot run from.
To reproduce:
- aggro some animal (in my case it was the deer)
- sail behind this point in boat (animal will stay at the other side, on shallow water)
- sail near animal (to attack distance)
- he "jumps" to that point
- sail back, and shot them safety with bow, or any else range weapon - he can't run from this point
