Let an Alliance MMA instructor teach you how to defend yourself against a two-handed wrist grab in this Brazilian Jiu Jitsu video from Howcast.
Guy grabs me by both my wrists. There’s no point panicking. How it is, his hands are tied up, your hands are tied up. All you do is swivel your hand in and out and you back away. He grabs me by my wrists. All I do is twist my wrists and I’m free. So guy grabs me by my wrists, no panic. His hands are tied up. My hands are tied up. I can strike him, knee into the groin area. And now I just turn my hands up, and out, and I’m free.