Dude, it's not so easy to get those 2 head shots. Thorn kicks like a mule. I can often beat Thorn users with the last word or three little words. Sometimes even my un-upgraded suros. I don't see it as being that OP. Any more than a very skilled player already would be. I bet most Thorn users could do as good or better with Timur's Lash. Probably also Hawkmoon, for those that have access to it.