Question for Brendan Conway on the Janus:
The Mask says “Once per session, you can affirm either your hero or secret identity to switch your Mundane with your mask’s Label.” That’s clear enough. It’s not a label shift, it’s an actual swap of values.
Gameface says “When you put on or take off your mask, you can shift your Mundane and Mask Labels appropriately.” I interpreted that as a label shift, changing Mundane and the mask label each by one, but my player playing the Janus interpreted it as swapping values as per The Mask.
Which was the intent?
You had it right! Gameface is signaling that the act of putting on, or taking off, the mask becomes meaningful to you in and of itself—but not as meaningful as “affirming your hero or secret identity”. It is just a label shift, with your Mundane or Mask Label going up, and the other going down, as fits whether you’re taking the mask off or putting it on.