Quick question re: Lupin's resignation . . .

[pippin_999]

No: HPFGUIDX 107354


Tooks:
 >However, I disagree that what occured that night in the 
Shrieking Shack would ever happen again.   The circumstances 
under which Lupin forgot to take his potion (the  only  time he 
forgot that year) were extreme - he was concerned for 
 the children's safety and most likely highly confused to see 
Wormtail  on the map.<

Pippin:

"As long as I take [the potion] in the week preceding the full 
moon, I keep my mind when I transform...."
-PoA Ch 18 

Lupin drinks his potion a week before his transformation in 
chapter 8, and it seems only one dose is mandatory. ("I made an 
entire cauldronful," Snape continued, "if you need more."
"I should probably take some again tomorrow") 

So Lupin not only didn't take his potion the night of the Shack, but 
for six preceding nights--what was he supposed to be upset 
about then?

Pippin
who thinks Lupin did take his potion, and was in his right-but 
-ever-so-evil mind when he transformed.