 CONT: When Dick Grayson during the circus attack by Two Face is  disposing of the bomb in the nearby river, the timer on the bomb is  inconsistent with the actual time the bomb explodes. When he first  pushes the bomb out of the hatch down towards the river it has  something like 6 seconds left on the timer. If the bomb went off  literally 6 seconds after that moment then it wouldve exploded way  before it even reached the river, let alone over the edge of the  building and several feet below the water.