OOC: So while the rules didn't and still don't spell it out, the 2 turns worth of actions to prepare were always fluffed as happening in a ready room before being teleported into the arena, and the player didn't know what he was fighting until their character was teleported. But anyway, I'm going to go with this rpg.stackexchange post, you deal double damage with the readied action attack, and then a separate, normal damage AoO as normal for an opponent leaving your threatened area. Also, no, it doesn't have reach, it is medium sized. I also fixed why the bite attack didn't work, fixed it but the attack missed anyway.