1) McCoy needs to learn how to QB better so he doesn't kill himself. That flat was open for a while, then his indecision takes him scrambling to the flat and then the late pass. Look, it was a penalty, but McCoy can't be dumb like that for the sake of his health. 2) Harrison is either dumb, or incapable of avoiding leading tackles with his head.
Watching Colt McCoy try to play QB against The Steelers is what I imagine watching Case Keenum in the NFL would be like. That was terrible.
Major props to McCoy for overcoming the cheap shot and coming back in. Unfortunately for the Browns, he didn't finish the job.