I think there maybe a problem with the group thing were others cannot attack a monster.A momentous had spawned out to my claim me and my wife got geared up to attack him and when we were ready we started fighting him " we had forgot to /group invite each other. " just after attacking him i started getting the message that it was my wife's mob so i did /invite command to have her join a party. and she did the /join command. after she joined my party she began getting the same message that it was TemperedAngels Monster and nether of us could attack it.After seeing this we both did /group leave and tried having her do the /invite command. It did not help and we had to wait the 15 minutes until he became free.Don't know if this is a bug or not but figured i would let someone know.. Thanks.