This just came up in my PbP playtest.
BArd/Marshal got brought to 0 so she's staggered. She can still take a swift action to spend a Mythic Point to use the Marshal Advance. Her question is, that since she's staggered and taken her move action earlier, is she allowed to use the move action from Advance as well?
I ruled yes since it's a sort of bonus move action and shouldn't count against her normal turn's actions.