Because the real Hermione was under an invisibility cloak ten feet away. (Not saying this is how it happened, but it does explain that part of the riddle)
Bellatrix was still transparent within the Cloak, but to Harry she was no longer hidden, he knew that she was there, as obvious to him as a Thestral.
It would have had to have been a different cloak than Harry’s, but then, I guess Hermione did have one on her; it might not have been good enough to hide her from the troll, but perhaps it would have hid her from Harry. And I suppose that obscuring the real Hermione from Harry would make sense under the ‘if you want to change the past, you can’t know if you’ve already succeeded’ rule, from the end of 76.
The silver outline blasted back into the world, and said in the strange outside version of Harry’s own voice, “Hermione Granger says,” the blazing figure’s voice became higher-pitched, “AHHHHHHHHH!”
I commented elsewhere that this is a major difficulty with trying to save her. Invisible Hermione would have to scream in the middle of combat to fake out the patronus, which is obviously an incredibly dangerous thing to do.
Hmmm… it’s also possible in that scenario that Hermione was hot-swapped out of the combat. Real!Hermione responded with a terrified scream to the Patronus, and while Present!Harry was racing to her on a broom, Time-Turned!Harry did some kind of obscuring spell (fog, blast of light, something like that), tossed an invisibility cloak (not Harry’s) over Real!Hermione, and then fed Simulacrum!Hermione to the troll just in time for Present!Harry to show up.
Because the real Hermione was under an invisibility cloak ten feet away. (Not saying this is how it happened, but it does explain that part of the riddle)
From Chapter 56:
It would have had to have been a different cloak than Harry’s, but then, I guess Hermione did have one on her; it might not have been good enough to hide her from the troll, but perhaps it would have hid her from Harry. And I suppose that obscuring the real Hermione from Harry would make sense under the ‘if you want to change the past, you can’t know if you’ve already succeeded’ rule, from the end of 76.
I commented elsewhere that this is a major difficulty with trying to save her. Invisible Hermione would have to scream in the middle of combat to fake out the patronus, which is obviously an incredibly dangerous thing to do.
Hmmm… it’s also possible in that scenario that Hermione was hot-swapped out of the combat. Real!Hermione responded with a terrified scream to the Patronus, and while Present!Harry was racing to her on a broom, Time-Turned!Harry did some kind of obscuring spell (fog, blast of light, something like that), tossed an invisibility cloak (not Harry’s) over Real!Hermione, and then fed Simulacrum!Hermione to the troll just in time for Present!Harry to show up.