So you can survive 3-4 spits. Lets say you go after a beast, he opens up with a spit. That means the third spit will come 15 seconds after the start. You can't let the beast start attacking you (because he'll grasp you and then auto attack you and you really don't have the health for that) so at best you get to attack him for, oh, 10 seconds of that 15 seconds, the rest you are running away kiting. (assuming no cooldown flag) That means you shoot him, oh, 7 times and run back to the health crystal. Man, that's scary effective. If it takes an entire 4 spits (and you better hope you are both stacking more speed then the beast and that there are no snipes/any help incoming for him) you might get up to 9-10. And thats assuming you manage to stay out of his auto attacking range, don't get grasped, and aren't getting affected by ooze.
Of course, since you have blade of the serpent it means he is faster then you - which means after the second spit you need to start running, because if he gets in range you are completely dead. You get some protection from the tower at first, but towers don't last long against a spit UB.
Sure, if you have a good ally with you, you can do a 2v1 where you don't get your ass kicked. But other then that? The numbers just don't work.
