I read the comments section yesterday and someone said that Professor Lupine was tired because he had just transformed into a werewolf.
As a result, I thought about it carefully and suddenly found a problem.
September 1, 1993, which is July 15 on the lunar calendar, was the day Professor Lupine was supposed to turn into a werewolf. Why could he ride the Hogwarts Express and attend the opening dinner?
Some people may say that the moon came out that night and turned into a werewolf.
But I checked and found that Christmas on December 25, 1993 was November 13 on the lunar calendar. At that time, Professor Lupine was already ill and could not attend the Christmas banquet.
Moreover, it is mentioned many times in the book that Professor Lupine asked Professor Snape to teach for several days each time.
This shows that before the 15th day of the lunar calendar, there should have been certain signs that Professor Lu Ping must take a rest.
Wolfsbane potion can only keep the werewolf sane, but cannot restore the werewolf to human form.
According to the above information, the werewolf transformation may last for a period of time, at least there are early signs, preventing it from appearing in front of the public.
But the author calculated another time.
According to the original work, the penultimate exam was the Defense Against the Dark Arts exam, which was invigilated by Professor Lupine himself, and that day was Thursday.
After the divination class that afternoon, the final exam ended, and Professor Lupine turned into a werewolf at night.
I checked the calendar and thought that day should be June 23, 1994, which happened to be May 15 in the lunar calendar.
After all, there is no full moon on other Thursdays in June, and it is far away from around the 15th.
In other words, judging from this information, the person will turn into a werewolf only on the night of the full moon (the 15th day of the lunar calendar), which is inconsistent with the statement that he was already sick on Christmas Day (the 13th day of the lunar calendar).
And I checked, it gets dark around eight o'clock in the UK at the end of June.
Buckbeak's sunset execution, plus a series of things that happened later, so I guess that Professor Lupine turned into a werewolf around nine o'clock in the evening.
If you calculate it this way, it seems to be consistent with what happened at the first-term dinner.
After finishing the dinner at nine o'clock, Professor Lupine rushed to the office and turned into a werewolf. He did not dare to eat sweet chocolate on the train in case the wolfsbane potion failed.
So the author is a bit confused about the specific situation of this werewolf.
As for why Professor Lupine can take the train, I just assume that he didn't transform this time, he was just tired because of other things.
The above is purely the author's personal guess, and is included in the remarks. If there are any questions, I hope you can point them out.
