Boxing 2 in the arenas is not going to turn out great results. You don't have the burst damage that 3-5 would have. No insta-kills. You just need to outlast your opponent. The problem is that you can only focus on one thing. If it's healing, you put out no damage and end up healing the entire fight until you either get cc'd or die.

Successful rogues tend to vanish, blind, sap, cheap shot a lot. You may find it difficult to do this when trying to keep your priest alive.

Arena is not easy for boxing. Ellay is just a pimp.