I play an elementalist and my most preffered spec is a scepter in main hand combined with a dagger in off hand, because it combinces ranged and melee attack, and has good utility. The best way to burst someone down is to knockback him in air attunement, popping arcane power and then use dragon tooth in fire and summon the phoenix right behind him, so it deals damage three times, following by fire grab and ring of fire. The main problem is, any decent player will dodge this burst using doubletap, which is unfair, because I cannot use full potential of my spells and thus lack damage. If they had to use a stun breaker, it would be ok, because they would have to do something. There is still a possibility to use an immobilize using a signet, but it is not guaranteed to succesfully land this immobilize, because it can be dodged too. That is the reason I have to knockback first and then use the immobilize, and thus using two cc skills to land a single burst. Without a stun or an immobilize, dragon tooth is useless in pvp. I agree that with arcane power popped up I am able to burst someone down rom 100% hp to 10%, but there are lot of ways to avoid this.