User blog:SuperVegito1229/Psychos beneath New Haven?

Okay, so I was playing Borderlands, on the Mission Seek Out Tannis, I had spoken to the Clap-Trap, but not to Tannis, and I was fighting the Bandits near the entrance to Rust Commons West. After defeating them, I made sure there were no more by bringing a Runner and trying to lock on, circling the gun. It locked on to a level 30 Psycho, and then onto a level 31 BA Psycho, but no other enemies. Any explanation?