Question in quidditch scene

[Amanda Geist]

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A question: the second time I saw the movie, during the Quidditch game, as
they panned across the Gryffindor stands--for a flash, less than a second,
in a gap between people, I saw a black form far off. It was not repeated.
Did anyone else with sharper eyes catch this? Was it Sirius in dog-form,
come to watch the game?

If so, I don't see why they kept that in, since the effect of his appearance
is now triggered by the cloud-Grim, and he does not later mention having
seen Harry fly.

~Amanda
Those who cannot hear the music, think the dancers daft.