Incredible opener, very hmm.. explosive.
Kate's crime is revelaed. The whole episode was intense. Shannon's buried, Sawyer's body 'taken over' by someone from Kate's past, timer almost running out... and the ending.
The episode was paced much better than previous episodes. Flashbacks were interesting, too. No boring stuff.
This episode also had several mysteries. For example Sawyer's takeover. The victim of Kate's crime came back... only wanted to know 'Why?..' As soon as Kate answered, the spirit gone, and Sawyer got much better.
Anyhow, the ending of the episode is incredible. Michael's adventure is on. And it wont stop until episode 24.