How recently did SS write in Potions book?

[Deb]

No: HPFGUIDX 141732


 > CV: Apparently not. Teen!Snape used sectupsempra on James.
 > 
 > Snape's Worst Memory (p 647, US ed.)
 > 
 > "Bad luck, Prongs," said Sirius briskly, turning back to 
> Snape. "OY!"
 > 
 > But too late; Snape had directed his wand straight at James; 
there 
> was 
 > a flash of light and a gash appeared on the side of James's face, 
 > splattering his robes with blood.
 > 
 Potioncat:
> I thought I was the only one who thought it was the same spell! 
Canon 
> doesn't say. I assume that Harry's spell did more damage because 
of 
> the emotion behind it.
> 
> I know in posts downthread the question comes up: how did Snape 
> practice these spells? Now, there's something I don't want to 
think 
> about! But he also had to come up with a "cure" and he seems to 
have 
> done that pretty well.


Deb here:
  Harry's spell did more damage not just because of the intensity 
of  emotion but also because: "SECTUMSEMPRA!" bellowed Harry from 
the floor, waving his wand wildly". IMO it was the wildly waving 
wand that caused the extent of the damage - he appears to be 
slashing wildly and wounds appeared all over Draco not just in one 
or two places. When Snape did this in the Pensieve memory his wand 
action appeared to be controlled - "... directed his wand straight 
at James..." . As to where he was practicing ... well we also saw a 
memory of younger Snape zapping flies... maybe he practiced his 
created curses on flies or other insects in the privacy of his 
bedroom.   

 Deb (djklaugh)