How you deal with these people..?

I recently had one of these idiots ksing me on my Dawn Warrior at Windraiders.
He was 10 levels below me and decided that he wouldn't leave the map until he leveled.

I had something like this happen at mp3 on my dw. I was level 50 and a lvl 63 or so came and starting killing everything on the map. I was able to kill the mobs pretty quickly so his level advantage didn't really factor other than he had his "flash jump" move maxed or close to it and I only had 1 point in mine. A bishop from my guild ended up coming to help, he bombed the top two platforms while I cleared around the jeep, but the other guy still didn't leave after 20 minutes of this. Then he comes down next to me and just spams his attack without moving for 15 seconds or so, levels and leaves. He ended up going to windraiders, I was tracking him on my hero later thinking about getting revenge.