Forbidden Fruit, Part 2C
Mitch has Level III powers. Marack and Xeriaux are only at Level II. However, any advantage or skill Mitch may have would be readily known to such an experienced telepath like Marack. So Mitch can hide his skills with that mask. But while he wears it he can't use his powers.
"The pain of the mind is worse than the pain of the body." - Publilius Syrus.