Naughty boy Bugs! I hope he didn't get too much of an upset tummy from all that sugar. Yes it's normal to feel a bit anxious about the bonding process and leaving the two of them together. I always felt apprehensive about a fight possibly breaking out too. Once they are bonded, it's not like minor scuffles stop altogether, it's that the rabbits lowest in the pecking order learn to handle the 'boss' rabbit asserting it's dominance better to avoid conflict occurring. So with my rabbits, one bunny that's higher in the pecking order, will chase after one of the lower rabbits. She might just nip one of them to get out of her way, or chase after them if they don't move fast enough or she's bugged at them for some reason. And they just move out of her way or run away to get away from her. Now if one of them didn't move or run away and nipped back at her, then a full out fight could occur. So it's not that nipping and minor chasing isn't going to occur with Bugs and Evie, it's that one of them has to decide to be the submissive bunny and put up with or avoid the dominant bunny's behavior. I'm guessing Evie is probably going to be the 'boss' bunny, so Bugs needs to decide he's ok with her being in charge, then they will be able to be fully bonded.