The main issue there is that if you are in an active group like mine if you stay there for the full 10 rounds the snake is just dead of very close to be. So the point is if is better to do 3-4 rounds, retreat, and go there doing another 3-4 rounds or not. In my experience you land more damage if you do 4 rounds, retreat and another 3-4 rounds than doing 10 straight. If, instead, you group is not much active or if your average level is low, then is better to do as many rounds as possible.