Never noticed this before, but the man in the light suit and hat next to Oswald does not look one bit surprised or afraid. He’s looking right at Ruby’s face as if he’s analyzing him, not looking at the gun or action at all.
Looks more like Bruce Willis, moonlighting.
Ruby was supposed to be a fixture at the local PD station and many Dallas P.D. Detectives and Officers a fixture at his nightclubs.
I remember watching the shooting when I was a small child. I remember my mom quoting one police officer she heard say, "Damn you, Jack!" right after Oswald was shot.