This is an epidemic with these tour groups. This happened on BTMRR one time. We were in the descending ramp area and all of a sudden this yellow wave was rushing towards us, overwhelming the normal guests waiting in line patiently. Cast Members were powerless to stop this yellow tsunami. They finally reached their leaders flag. The crowd was becoming increasingly aggravated as we came up for air. Many of us let every cast member we saw know what had happened, and it seemed, that in the end they were at least spoken to about what they had done. Alas, I do not believe it made much of a difference.
Maybe in Brazil you do not wait in line. Maybe it is a fight to the finish and the strongest go first?