A legally blind man who has been trained as a reserve police officer in Texas came upon a struggle between two officers and two teens—one of whom was armed with a gun.

According to Fox News, Officers Matthew Brazeal and David Woolbright had responded to a report of shots fired at a local bank.

As the officers attempted to detain the subjects, a struggle ensued, and 57-year-old James Walker—who was leaving the bank with his service dog—leaped into the fray.

Walker, who is now legally blind, went through police academy training and was a reserve officer for three years but never served because of his failing eyesight.

The Fort Worth Police Department said on Twitter, "Mr. James Walker, you were able to show empathy and concern for everyone involved. Based on your experience and awareness, you came to the aid of officers in need by tactically assisting in the arrest process. Two officers went home safely to their loved ones thanks to your efforts on that day. Mr. Walker, you truly have a guardian spirit, and for this, the City of Fort Worth and the Fort Worth Police Department commends you (and thanks you) for your actions."