The "Moon" is the Sheep target!

Could we get a game wide confirmation on this? Love to CC to assist in the fights. Tanks "mark 'em up" and roll out. Most of the time moon is mine, sometimes I sheep the moon and get yelled at cuz star was the sheep.

p.s. Why do DK tanks mark a sheep for me then drop a big ol' DnD right on its head?

p.p.s. Arcane rules.