Very subtle slip-up from Lupin

owlpostagain:

In PA, Snape tries to access the Marauder’s Map.

When he realizes
what it is, he brings Lupin to his office to “discuss” the origins of the map.

For the duration of their conversation, the map is either in Snape’s hand or on Snape’s desk. Lupin never even touches it.

And when Lupin goes to leave:

“Well!” said Lupin, clapping his hands together and looking around cheerfully. “That seems to clear that up! Severus, I’ll take this back, shall I?” He folded the map and tucked it inside his robes.