Discarded "mask"

[Tru_in_Blu]

I also have a question on a catcher's detached mask/helmet.

Batter pops up. Catcher removes mask/helmet and tosses it into foul territory. She loses sight of the ball which:
a) on the fly, lands in the catcher's helmet in foul ground;
b) contacts the catcher's helmet in foul ground and bounces directly into fair territory where it comes to rest.

Is either or both simply a foul ball?

Thanx.