Although he was surrounded by hundreds of cultivators, Adam decided to become invisible, which he could do through his Stealth Ring. Then matched with his Form Concealment capability, the Black Dragon Gang members would be unable to see or sense where he was.
They were all rowdy and making a lot of nice, while they were also crowded quite closely together, so there was a lot of confusion and it would take them a few seconds to realise that Adam had disappeared.
In those few seconds, he planned to reach the 3 powerhouses that were left of the Black Dragon Gang and take them down, then search for the Head of the Gang, who even in the Hyperactive Mental State, Adam was unable to find.