The Mustangs were down a point to Richards in the game's final 10 seconds as the Bulldogs tried to inbounds the ball in the backcourt.
Then, Serven looked over to teammate Kevin Murney.
"I've got to give a lot of credit to Kevin. He heard the inbounder say 'Pop! Pop!' He gave me that look like 'Let's get on him defensively," Serven said. "We both made the jump when [Richards] got the ball, and I got the steal."