Sorry for not reply u, but idk why doenst work for u, maybe u can do a clean on ur pc or update grafics cards, idk.
If have idk do mastery in BD, but you can find hack for infinite HP for mastery, where one player hit enemy with life infinite and mastery level increase a lot, however the time increase for at less 1:45 in SD room.
[IK, Ive Bad English]
thx o/