Q154 The Mystic (v3) in the Bestial Form discipline (Of the Inmortal), the Bestial Claws have no action requirement, so applying the explanation on how to use disciplines would it be instant?

Q155 How does an Invisible creature work while mounted, (Lets go with a Warlock Imp for the sake of the example) those the rider count as an "objected being carried" by the mount so the rider would get invisible with it?