Snape at Slughorn's Party

Tue Aug 15 17:48:22 UTC 2006

No: HPFGUIDX 156961

I'm re-reading HBP (actually reading it to my 7 year old at bedtime).  
We were just reading about Slughorn's party which Draco crashes.

Snape is angry and upset to see Draco crash the party.

Why?

Draco is nasty to Snape (he thinks Snape wants to steal his thunder) 
but there was something in the way JKR worded Snape's reaction that 
makes me think it is important.

Does anyone have an opinion on this?