Is it possible (has anyone tried):
a) to kill lets say 6 bosses on Mythic, switch to heroic for 7th and then back to Mythic for 8th and so on?
b) if I have a 8/14 Mythic lock in the same reset, can I continue from 8th boss if I change the difficulty to heroic on another day or do I start fresh heroic?
As all lockouts are separate now... This part I don't really understand very well.