The Silver Air Barrier was a skill that created a defensive barrier around one's body and was very effective against groups of people. Unfortunately, the Silver Air Barrier also had a disadvantage: it required a significant amount of energy to maintain. Most cultivators at the seventh rank would only use the Silver Air Barrier in emergencies because they could maintain it for only about ten seconds. Since Bobby was at the peak of the seventh rank and had also trained in the Returning Breath Technique, he could maintain the barrier twice as long as regular cultivators at the same rank.