I'm gonna say Last Word is my anti-Thorn. I'm rather good at making people lose line of sight, so I crush them with the Last Word once I lure them a bit closer. :) I also use Three Little Words and Plan C/The Trolley Problem at other ranges to make life difficult for Thorn users. I tend to agree that the damage over time is a bit much from the Thorn (you cant tell me all of those deaths/virtually no health at all near deaths were all headshots where I got hit twice!), but at least I found some usable counters. Typically overconfident Thorn players who don't realize that there ARE weaknesses to the Thorn. >=]