Bill Harken is an Alpha; his power is the ability to create an extreme amount of strength with the "fight-or-flight" response. Bill used to be an FBI agent.
Gary: Give me the gun I'll shoot it.
Bill: Gary, I'm not giving you my gun.
Gary: Yeah, give me your-no, you're right. Give me a grenade.
Gary: It's illegal to go that fast.
Bill: Yeah well, if you think that's illegal you watch this.