I know Jeff Thomson having same action. But it doesn't mean that if you have not taken action at that time so you are not supposed to take action now also. Bowlers like Muralidharan and Malinga (May be inspired by Thomson) are setting wrong trends into the new generation of bowlers. Rules are not meant to define before the game. You need to make the rules and amend them as and when required. Now it's time to rethink on the rules of bowling.
