Disable PVP in the boss arena as soon as the egg is placed

Once a player places a boss egg, that player gets priority to start a boss (other players can't place their eggs), which I think is good, but the player that has the GUI open can still be attacked. This means that if the player that placed the egg, but hasn't started boss yet (GUI open) gets attacked, they then have to rush through the GUI to start a boss which I don't think is ideal. Not really an issue for this season, but if the playerbase is larger it becomes more likely this could happen. With a small playerbase this is unlikely, but could become an issue if the playerbase grows significantly. I suppose the other option is to disable PVP in the arena entirely (as it was last season).