They had Adam for the first couple of minutes, that was for sure. When they hit him, it was like getting smacked with a wrecking ball. One metallic fist caught Adam in the skull the moment the door closed. He needed a second for his brain to unscramble itself a little. Only problem was, he didn't have a second because then the other robot slammed him against a wall.
Therefore, it took him three full seconds to get himself together enough to defend himself.
After that, though...