why is it not 2.4 or 2? Who decides this arbitrary number?
This is the problem expressed in as few words as possible. It's kind of farcical that Bell would have been given out if he was say, only 2.49 metres down the crease. Assuming that the reason they have set this arbitrary number is that they don't have faith in Hawkeye's accuracy, it only puts further doubt into the viewer's mind as to whether the technology is reliable.