Is It Not Ball Tempering From Umpire Unconsciously

Advancement in technology has brought new phenomenas in the game of cricket.  On one side the latest technology is in use for judging the umpire decisions on LBWs, on the other side viewers can have a close watch on every action of the player standing in the field. So many times players have been observed doing some thing wrong with the ball. But here is an other issue.  Umpire is doing some thing extra ordinary with the ball. But no one has observed it. One can say that the ball was wet and he was removing its wetness, but was this method which umpire adopted is acceptable. To me, what umpire did with the ball can be very important in getting reverse swing. So, watch this video and express yours comments.