Obviously you take the time to think about this decision, but the raising of the dreaded index finger means that the batsman has to leave the crease.
There are many ways to get out in cricket, but there's only one signal and as soon as that finger goes up, the batsman's got to go.
If there is any sign of dissent, the referee would come in to play and dish out punishment if he sees fit.
He hates dissent or anything like that and rightly so.
Players not only have a responsibility to the team they're playing for - they have a tremendous responsibility to everyone who is watching the game.
They must make sure this game is played properly and will last for future generations.