Rules favor the offense in arenafootball2, so playing any defensive position is a chore. Linemen aren’t allowed to stunt or twist. The ‘Mac’ linebacker can blitz, but he’s limited to lanes on either side of the center. The ‘Jack’ linebacker must stay within 5 yards of the line of scrimmage. Then there’s the middle defensive back spot, which just might carry the toughest job description in pro sports, according to Spokane Shock head coach Adam Shackleford.