"Make it, take it" rule in effect tomorrow at Probowl as a test. (Onside kick alternative)

Rule needs to be worded in such a way that a team must gain 15 yards by themselves. Any penalty results in a replay that 4th down. That would take away the DPI past 15 yards and limit any confusion about maybe a 5 yard defensive holding penalty. That should not count the same as gaining 15 yards which is what I think they are aiming for.