I think that the only positive Nerf I can think of is removing the dot if the player using thorn is killed. Let's say someone is hitting me with thorn and I out-gun them; I believe their dot should disappear from me so that it doesn't automatically kill me. This would remove a lot of given kills from thorn and reduce frustration by knowingly out-gunning someone but still dying anyway. Or reduce its fire rate. Idk, it can still be stopped pretty well if using red death to counter.