from his viewpoint the other direction -- just emptiness.
we see ben ascending the stairs originally taken by the dignitary and his group.
we see ben hurrying down the stairs. jo rushes into the lobby and, seeing ben, dashes towards him.
from their viewpoint we see the prime minister, obviously not wounded sufficiently to incapacitate, being escorted down the stairs by his aide and other members of the staff, including woburn of the special branch. the prime minister is indicating his arm and obviously by the way he waves his hands, is deprecating their concern about his wound. in fact he is rather over-doing it. just beyond them at the top of the stairs we see 'buchanan' standing with the ambassador.
from their viewpoint a grim 'buchanan' is standing at the top of the stairs.