replay booth (turnovers, scoring plays, and any play inside of the two-minute warning). This change was prompted after last season's Thanksgiving Day game when Detroit Lions' head coach Jim Schwartz threw a challenge flag on a play where replay clearly showed Houston Texans' running back Justin Forsett's knee touched the ground, but was able to get up and score a touchdown. Due to the way the rule was written at the time the penalty for the errant challenge prevented the play from being reviewed. Under the revised rule teams will be charged a time-out (or an unsportsmanlike conduct penalty if the team is out of time-outs) when a coach throws a challenge flag on a booth-reviewable play, but the play will still be reviewed if the replay booth believes a review is necessary. This change has been referred to as the "Jim Schwartz rule". Making it a fumble when a player loses possession of the football while in the act of trying to bring it back to his body. This abolishes the so-called "tuck rule" which was adopted prior to the season. Under the revised rule it will be ruled a fumble when a quarterback loses possession of the ball after a pump fake while bringing the ball back to his body. Tight ends and H-backs will now be permitted to wear uniform numbers 40-49 as well as 80–89. Previously the two positions were treated separately with tight ends allowed to wear only 80-89 and H-backs limited to wearing 40–49. "Peel-back" blocks will now result in 15-yard personal foul penalties anywhere on the field. Previously, these type of blocks were permitted within the tackle box. On field goal and extra point attempts, long snappers will now be considered defenseless players. In addition, defensive players are prohibited from blocking low at the snap of a scrimmage kick. For field goal and extra point attempts the defensive team can have no more than six players on either side of the ball at the snap (5 yard penalty), and players cannot push teammates into blockers (15 yard penalty). Any player at least three yards downfield or outside of the "tackle box" who leads with his helmet on a hit will be penalized 15 yards for unnecessary roughness. If both offensive and defensive players lead with helmets on the same play, both will be penalized. Player safety changes Upon recommendation by the league's Head,