After the attack, the robber took off from the "L" stop, heading west on Addison on a skateboard, O'Brien said. Officers at the station were able to get a description of the attacker from the victims, and broadcast it to other officers in the area, who caught up with him as he headed north in the 3700 block of North Racine Avenue, and arrested him in the 1100 block of West Waveland Avenue.