Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
This is critical for catching escaping champions. Flash doesn't work as well for mord because he is more of a sustained damage champion than a burst. There are a few cases where flash would work, but in most ghost does the job better. And this is good for ganks to.
Really good to deal MOAR damage.
With low hp, use this, and you can kill with your tornmail and survive..