Som en betrodd lärare var han troligen inblandad i att skydda stenen på andra sätt.
Snape verkade vara aktivt involverad i att skydda sten på andra sätt än potions gåtan. Han gick för att kolla på stenen när han fick benet av Fluffy, som var kvar i filmen.
“Snape was holding his robes above his knees. One of his legs was bloody and mangled. Filch was handing Snape bandages.
‘Blasted thing,’ Snape was saying. ‘How are you supposed to keep your eyes on all three heads at once?” - Harry Potter and the Philosopher's Stone, Chapter 11 (Quidditch)
Dessutom kunde han ha hjälpt till att planera försvaret eller ge idéer till Dumbledore för hur man bäst skyddar stenen.
Ännu i boken är inte potions gåtan det enda han bidrar till för att skydda stenen. Han är misstänkt för Quirrell, berättas av Dumbledore att fortsätta att titta på Quirrell:
“You see what you expect to see, Severus,’ said Dumbledore, without raising his eyes from a copy of Transfiguration Today. ‘Other teachers report that the boy is modest, likeable and reasonably talented. Personally, I find him an engaging child.’ Dumbledore turned a page, and said, without looking up, ‘Keep an eye on Quirrell, won’t you?” - Harry Potter and the Deathly Hallows, Chapter 33, (The Prince's Tale)
Och konfronterade Quirrell om var hans lojaliteter ligger.
“… 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 Philosopher’s Stone, after all.’ Harry leant 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 towards 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.” - Harry Potter and the Philosopher's Stone, Chapter 13 (Nicolas Flamel)
Dessutom är han den som skickas för att kolla på Stenen när hans ben är mauled av Fluffy.