They did leave the room and go to a graveyard before Hermione was resurrected.
The reader sees them leave the room and go to a graveyard. But whether or not they in actuality left the room depends on how the mirror transmits information. Yvain is leaving open the possibility that Harry is hallucinating this (with the mirror’s help), and giving it high probability because of how much is going in his favor very quickly. I agree that’s a possibility, but think it’s unlikely given how the canon mirror operated and the evidence we have of how the MOR!mirror operates.
The reader sees them leave the room and go to a graveyard. But whether or not they in actuality left the room depends on how the mirror transmits information. Yvain is leaving open the possibility that Harry is hallucinating this (with the mirror’s help), and giving it high probability because of how much is going in his favor very quickly. I agree that’s a possibility, but think it’s unlikely given how the canon mirror operated and the evidence we have of how the MOR!mirror operates.
I see. Point taken, then.