rumors of Dumbledore's escape

[tyoria]

No: HPFGUIDX 75621

hello, I'm new here. :)

I just wanted to know if anyone else caught this error, at the 
beginning of chapter twenty-nine:

"The notices had gone up all over the school overnight, but they did 
not explain how every single person within the castle seemed to know 
that Dumbledore had overcome two Aurors, the High Inquisitor, the 
Minister of Magic, and his Junior Assistant to escape."

But Dumbledore DIDN'T overcome the Junior Assistant, remember? Fudge 
sent Percy off to deliver an owl just beforehand. Is this an error on 
JKR's part, or a clue? 

I notice that in the previous chapter, Harry feels something brush 
against him that he later attributes to Kingsley's spell. But what if 
it was someone in an invisibility cloak leaving the room? They would 
have known that Harry and Marietta were the only students to have 
witnessed the scene, but they WOULDN'T have known that Percy left 
shortly afterwards, so they assumed that he was still in the room 
when Dumbledore made his getaway. That could also explain why some of 
the other information the students had was inaccurate, like Fudge 
having a pumpkin for a head...