I hear “hang mike pence” but no mouths on it seem to be saying it.
It could be 3 people behind the camera chanting it, or it could have been added later on.
In any case, this video shows indeed that the police were indeed inviting these people inside. (Holding the door even?)
A woman was trampled to death. I would rather let people in once the politicians inside were secure than have people trampled to death.