Failure of the left engine is possible... the aircraft was in its initial climbout after takeoff, its trajectory certainly appears to be more of an approach to landing which initially on my first view of the video what i thought it was doing, but this is apparently right after takeoff.
like i said - amazing anyone came out of this event alive.
I've done hundreds of V1 cuts in the Level D Simulators... but i often wondered just how comparable that would be to reality - in the hot August sunshine in Texas with a full loadout at high density altitude...