Lachlan was exceptional in concealing his essence, indeed. Felix hadn't sensed anything at all, and he would've failed to escape if not for Helen alerting him.

When he was about 150 feet away from Felix, Lachlan struck.

The essence Felix sensed in the air told him that he was facing a Celestial Realm martial artist. As he'd guessed prior, Lachlan hadn't come alone.

Lachlan didn't think much of Felix, but Felix was not only one of the contestants people thought was most likely to win the comp