Mr Angry.
I think it was the pressure of being squeezed between management and crew. The former wanted as much as possible (methods for this have been done to death in here) while the latter didn't like it.
It must be a thankless task. Just as they think they've got the scheduling sorted another change comes along and all their work goes to pot.
Try doing that with the (little known) fifth horseman of the apocolypse hanging over your shoulder. No thanks.