Did Dumbledore och Snape har en plan, för när Quirrell stal Philosophers Stone?

I Dödliga Hallows lär vi oss att Dumbledore frågade Snape att hålla ett öga på Quirrel. Vi antar att han trodde att Quirrel var fiskig.

Keep an eye on Quirrell, won't you?

Jag antar att någon gång efter det att utbyte efter den punkten i Philosophers Stone talade Snape med Quirrel om skyddet av stenen i den förbjudna skogen, förmodligen konversation om hur man kommer förbi alla skydd .... (Snape kan ha handlat info med Quirrell)

"... d-don't know why you wanted t-t-to meet here of all p-places, Severus..."

"Oh, I thought we'd keep this private," said Snape, his voice icy. "Students aren't supposed to know about the Sorcerer's Stone, after all."

Harry leaned forward. Quirrell was mumbling something. Snape interrupted him.

"Have you found out how to get past that beast of Hagrid's yet?"

"B-b-but Severus, I --"

"You don't want me as your enemy, Quirrell," said Snape, taking a step toward him.

　"I-I don't know what you

"You know perfectly well what I mean."

An owl hooted loudly, and Harry nearly fell out of the tree. He steadied himself in time to hear Snape say, "-- your little bit of hocus-pocus. I'm waiting."

"B-but I d-d-don't --"

"Very well," Snape cut in. "We'll have another little chat soon, when you've had time to think things over and decided where your loyalties lie."

Såklart Snape (som spelar dubbeltagenten som alltid) och därför visste Dumbledore att det bara var en fråga om tid innan Quirrell försökte stjäla stenen. Snape och Dumbledore hade en reservplan, eftersom jag tvivlar på att de planerade att den gyllene trioen skulle spara dagen.