OOP: Ch 28 - Does Draco Know?

[Pasiphae]

No: HPFGUIDX 61906

*a six-month lurker pokes her head out to make her first post*

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As I was looking back over a few parts of OOP today, I noticed something 
about the scene where Draco walks in on the Occlumency lesson in chapter 
28: is it possible that Draco knows (or will figure out) that what was 
going on in Snape's office had nothing to do with Potions, remedial or 
otherwise?

Upon opening the door to Snape's office, Draco sees Harry and Snape 
standing with their wands out.  We know Snape's wand is raised; it's 
specifically mentioned that he lowers it (p638, US edition). Have wands 
*ever* been used in Snape's Potions classes?  I can't recall any instances 
offhand; please correct me if I'm forgetting something.  In fact, one of 
the first things Snape tells his class in SS/PS is "As there is little 
foolish wand-waving here, many of you will hardly believe this is magic" 
(p137 in my copy of SS). As far as I can tell, there's no cauldron or other 
potions equipment at the ready to back up the Remedial Potions cover story.

Then there's this line, as Draco leaves Snape's office:  "Malfoy mouthed 
*'Remedial Potions?'* at Harry behind Snape's back before following him." 
(p 639, US edition)  That question mark...has Draco snapped out of his glee 
at hearing about Harry's need for tutoring and is starting to see how fishy 
the situation looks?  Even if he isn't suspicious at that point, Draco's no 
Crabbe or Goyle.  Surely it'll hit him at some point how odd the situation 
was.

Then there's Sirius' comment about Snape being Lucius Malfoy's lapdog 
(p520, US edition).  If Draco becomes suspicious of Snape and passes that 
info along to his family, I worry that it'll cause a setback in Snape's 
work for the Order, whatever the particulars of that may be.

-Pasiphae