something exploded out back you were at altitude and then you had this decompression. what would you do? purity speed brake, thrust forward, you want to get down as fast as possible. we would put our oxygen mask on. reporter: this is kind of an emergency and definitely would be. then you want to get the plane down low because the passengers would not be breathing or breathing on those emergency masks that come down. you need to get them down to a point where they can breathe on their own. the other thing is the turn. the turn would imply you re going back to kuala lumpur, the airport you left a short time ago or maybe you re turning to the west to get to a nearby airport where you can set this plane on the ground and have everyone treat forward this emergency. so that is scenario number one. how the drop and turn would support an emergency. level us off if you would, mitchell. leapt me show you how this data is actually being told cnn by a