American football have it, and so does the NBA. Will it make a difference to the sport or will it only contribute to the breaking of the game flow ?

NBA teams find it absolutely critical cos its helps the team to regroup in the last few minutes or seconds of the match and helps to counter the opposition or even find a dynamic route thru their defence.

How will it help football? Can it help when ure team is 1-0 down and everyone needs a kick up their backsides to get back on track? Or would it be detrimental to your side, especially when your team plays free flowing football?