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Continuity mistake: When Xenophilius draws the Deathly Hallows symbol, he draws it so that the bottom of the line touches the bottom of the circle. The shot cuts away and back again when he draws the triangle, but the line is no longer touching the bottom of the circle. (01:49:40)
Answer: Lucius and Bellatrix were unable to confirm Harry's identity because Hermione had jinxed his face to disguise him just before the snatchers captured them. They are fairly certain it is Harry, but as Bellatrix says, if they summon Lord Voldemort, and they are wrong, he will kill them all. Of all the Death Eaters at Malfoy Hall, no one knows Harry better than Draco, having spent more time with him because they were schoolmates. Lucius and Bellatrix have to be absolutely sure that this is Harry Potter.
raywest ★