How recently did SS write in Potions book?

[Hagrid]

No: HPFGUIDX 141697

--- "TrekkieGrrrl" wrote:
> Obviously Snape, as the HBP, has been able to not just invent 
> the "silly incantations" ...  with the sectumsempra and the other 
spells he has alledgedly invented.
> 
> There's something here that seems out of tune to me.
> 
> ~Trekkie
>

~aussie / norbertsmummy

"Alledgedly" made something click with me. There are inconsistancies 
in the potions book with teen Snape.

- Why call himself a Half-Blood while in Slytherin?

- Who could he practise the "sectumsempra" curse on while a student 
without getting expelled. (Remember, McGoonagall heard what Harry 
did to Draco, yet didn't recognise the injuries from Snape's years 
at school. Both she and Mdm. Pomfrey were at Hogwarts then and would 
have remebered Snape for inventing something that causes such wounds)

- Much of the hand-written entries were faded and hard to read ... 
but not all.

I suggest Snape had been using that Potions book at different times 
while teaching and that is why it was handy in the shelves. Snape 
would have left most of the Potions supplies for the in-coming new 
potions teacher, and the book was an oversight. After all, Harry 
took posession of the book in his first week (ok, maybe his first 
day, but don't make me look that up).

"Sectumsempra" may have come at another time ... and like-wise, 
Snape refering to himself as the "Half-Blood Prince" may have been 
after he returned as teacher.

That would also explain how Harry could surpass Snape in potions 
during Severus's student years according to Slughorn. Why?, because 
some techniques were added on after Snape finished being a student.
~aussie~