Requirements:
badContent (teleport hack)
1. record 2-3 locations at the area of the npc (please avoid buildings, because you can't teleport through them)
2. get aggro
3. teleport fast between the recorded locations until the npc gets stucked
4. voila` attack the npc until he's dead, he will not attack you
DON'T MOVE AFTER STEP 3, IF YOU DO, THE NPC WILL BE UNSTUCKED