The only reason for a GA after touch down would be a suddenly blocked runway.
Gotta disagree there. A bounce after touchdown may lead to a decision to GA after the initial gear contact.
As far as I can see, this
was a bounce then GA. The spoilers have deployed at touchdown and, assuming the 747 logic is the same as the Airbus, this would mean TOGA wasn't pressed until after the bounce.
Textbook stuff it appears to me: bounce, press TOGA, hold the pitch attitude until clear of terra firma and away they go.
Anyway, a fine job by the crew, why are we even discussing this anyway?