By Daniel Chavkin The Penn State coach explained why these teams got into a fight in the tunnel. At halftime of Penn State’s game against Michigan on Saturday, the two teams got into a shouting match before heading to their separate locker rooms. Apparently that shouldn’t have come as a surprise. Penn State head coach James Franklin said the way that Michigan Stadium is designed, it is somewhat common for Michigan to get into fights with other teams in the tunnel. “The one tunnel is a problem and has been,” Franklin said on Tuesday. “We’re not the first team to get into a jawing match in the t…