Instructions:
1) Get a level 2 gladiator's sanctum. Quest: nemesis hunter: hunted should appear.
2) Start moving and click on a statue, then stop, dropping the cast. If you've done it right the statue should still be grey but you can turn in the quest.
3) Turn quest in, it should then be offered again.
If any statue catches fire abandon the quest and start again.
This one won't last long.