Someone really blew it there

Either some poor called plays or very poor execution. UNT 2nd and 2 from the Clemson 37. RB James Hamilton is stopped for a loss of two, then Tune tries a short pass to Hamilton in traffic, and he's tackled for a loss of 1 to the Clemson 40. UNT goes from scoring opportunity to punting in two plays. Where was Dunbar?