Chamber of Secrets and Snake err.... Snape

[Karen]

No: HPFGUIDX 148045

OK, at the dueling club meeting Snape whispers something to Malfoy when 
they are just supposed to be disarming. On the count of two instead of 
3, Malfoy throws the serpensatia spell creating the snake. What was it 
Snape whispered to Malfoy? Do you think he gave him the spell? Why? It 
certainly revealed a lot about HP to him. If he is ESE!Snape, that 
would be a juicy tidbit for the Dark Lord. Just interesting that that 
"whisper" was deliberately inserted by the author. Red herring? Maybe.