What are the things considered as obstructing the field in cricket,
as like the match played between KKR and PWI in which Yusuf Pathan was given out obstructing the field as he pushed the ball with his leg for which the team approached the umpire.
The other incident which i know is for PAK vs IND where Inzamam - ul - Haq was given out when he placed his bat in middle of a throw on account of which he was given out.
One more incident (i am not able to remember the match time and opponents) which i have seen in which Rahul Dravid used his leg to stop the ball going on the stump after it hit the bat and he was also not given out - is it was not obstructing the field
But when the same thing happened with David Hussey in CB series in the match IND vs Aus he was not given out.
My question is not "Why he was not given out?" My question is "What are the things considered as obstructing the field?"