I absolutely loved how Agent The Rock had international terrorist Shaw in his gunsights... AND LET HIM WALK AWAY!
Here's a guy who we have seen murder at least 100 policemen/soldiers/DSS agents with his bomb at the construction site, has stolen two components of this doomsday macguffin, and the agent in charge of catching him has a gun trained on him AND HE DOES NOT SHOOT! The only reason for this is that we have to add in a few more chase scenes.