Yeah, you can only sneak attack once per round.
Based on what you know so far, there will be no problems with Tharos shifting away from the dryad. He'll be able to leave the aura squares without problems - it's entering them that causes damage.
It's not a huge problem to post early, but I'd rather you post closer to when it will be your character's turn. Knowing what other people plan to do is useful, and helps teamwork. But knowing what the rolls are is a bit less cool. Bonuses (or defense debuffs) can be applied with extreme precision if other players' rolls are known in advance, for instance.
Obviously, we're not going to go one at time - PbP combat already takes forever - so the problem can still creep in anyway. And faster is better. Naturally, if you expect to unavailable in the near future, then by all means post something now.
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Reed has a Misty Step thing ready to go from Eladrin 1's death.
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I'd like for players to submit orders for Torment. And Narbel, if IG doesn't show up soon.