{{Muggles' Guide to Harry Potter/Intermediate Spoiler}}
Snape callssummons Lupin intoto his office by throwing a handful of glittering powder into the fire. TheThis powder is probably similar to [[Muggles' Guide to Harry Potter/Magic/Floo Powder|Floo powder]], though it does not show quite the samereacts effectsdifferently (Snape's fire does not burn green, for instance, and Snapenor does notSnape have to stick his head into the fireplace to talk to Lupin, he merely has to speak), and it shows another way of communication method within the wizardingWizarding world. We will see Floo powder used for communication by [[Muggles' Guide to Harry Potter/Characters/Amos Diggory|Amos Diggory]] and [[Muggles' Guide to Harry Potter/Characters/Sirius Black|Sirius Black]] in [[Muggles' Guide to Harry Potter/Books/Goblet of Fire|''Harry Potter and the Goblet of Fire'']], and by Sirius and Harry in [[Muggles' Guide to Harry Potter/Books/Order of the Phoenix|''Harry Potter and the Order of the Phoenix'']].
Snape's explanation of why he owes James Potter (and, by proxy, Harry) a life debt is biased towards his own feelings: Snape believes that the jokeprank Sirius had planned (which we learn later was to send him to the Shrieking Shack while Lupin, who is a [[Muggles' Guide to Harry Potter/Magic/Werewolf|werewolfWerewolf]], is transformingtransformed) was planned by all four of the Marauders. However, James was unaware of it until a few momentsshortly before the moonrise, and he interceptedrushed to intercept Snape, saving him from a certain death, though Snape remains convinced that James only saved him to protect himself from getting into trouble.
While in Snape's study, Harry suspects that Snape is reading his thoughts; this is the second time he has felt this sensation, and this has actually bothered Harry since his first year at Hogwarts. In [[Muggles' Guide to Harry Potter/Books/Philosopher's Stone/Chapter 13|''Harry Potter and the Philosopher's Stone'']], Harry wonders whether Snape has this ability. Although Snape's close inspection of the One-eyed Witch statue hints that Snape might have glimpsed the secret tunnel in Harry's mind, Harry did not sense it then. This does tie in with Snape's [[Muggles' Guide to Harry Potter/Magic/Legilimency|legilimencyLegilimency]], which we will learn about in [[Muggles' Guide to Harry Potter/Books/Order of the Phoenix/Chapter 24|a later book]].
We learn later that Lupin is actually a Marauder of the Marauders' Map, the others being James Potter, Sirius Black, and [[Muggles' Guide to Harry Potter/Characters/Peter Pettigrew|Peter Pettigrew]]. It is a little surprising that Snape does not know this, though he seems to have some suspicion that there might be a connection between "Moony" and Lupin.
