Now, Mary and Velma could not just tell Gerard their plan, and what they wanted him to do, though no doubt he would be very effective if he knew what they wanted. The problem was that if anyone had any intentions regarding Lex, good or bad, he would immediately sense it.
Perhaps only Dao beings could get away without alerting his senses. The only reason why he hadn't already discovered Mary and Velma was not because of the isolation formation.
No, even though Mary was technically a Dao Lord, the strength she had available to her was too limited. If Lex wanted to, he could easily look through it. The only reason he wasn't doing so was because he was giving them their privacy.
