In a state where mixed martial arts is still illegal, MMA Fan Joseph Lozito used his years of watching MMA to subdue a murderer on a stabbing spree in the New York subway.

With a leg sweep, Lozito helped knock down the killer (Maksim) Gelman, a drug addict with numerous prior arrests. Lozito said that watching mixed martial arts on television helped him takedown Gelman.

“I guess you watch it for 20 years, you just pick up some things through osmosis,” said Lozito.