I believe he was suppose to take out some defenders with a route or set up a block for DT. He botched the play. There is an article on bleacher about it.
He was supposed to be the lead blocker on a screen play but just let 2 guys run right by him without hardly getting a hand on them. This play honestly has been a showing of our first two games in a couple of guys each play just thinking we are good enough for them to slack off some. Good to see Peyton working to keep them accountable