That video ends with the hold back in place but the launch bar raised. The other (not exactly earth shattering) half of the process would be the launch bar being lowered and driven over the shuttle, the shuttle being brought home on the launch bar, the whole system being put into tension, aircraft coming to full power and the launch bar being pre-emptively retracted (but staying 'home' in the shuttle detent).
One salute and you're off to the races.