i think shadowing is simply dishonest.... it is effectively stealing;
like sneaking into the cinema or onto the bus via the exit doors.
it is freeloading off others who stump up the fee....
if i was instructing, i would get the class into a huddle so i could whisper the theory / talk thru....
aside from that... it is funny to me, that being called a 'skier' is perceived to be an insult (and rigtly so!
)