Ves could have worn one of the masks he prepared as a backup, but his intuition advised him against doing so. Masters emerged from the most capable, hardworking and smartest Seniors.
Each Master was an exceptionally grand figure within the mech industry. Though Star Designers still hovered above their heads, a Master wielded enough clout to influence the political direction of an entire state!
Such eminent figures did not get to reach their current rank by being easy to fool.
There was another reason that restrained Ves from resorting to his usual antics. Of every mech designer he met, Master Olson was not a bad person by any means. She never mistreated or exploited any of her Apprentices and subordinates that he knew of. Oleg and Horatio seemed very happy to serve their Master.