Snape isn't evil

[zgirnius]

No: HPFGUIDX 143528

<le_green_dragon at y...> wrote:
>

> Are you suggesting that Snape killed Dumbledore because he realised he
> was dying anyway and that there was no way Snape could fight his way
> passed the DEs in time to get his potions kit and save ADs life? 
> Aren't you overlooking the fact that Snape's face was contorted with
> hatred when he killed AD?  I think he may have his own agenda, and not
> be entirely loyal to LV, but I don't think he ever was loyal to AD; 
> he just played his part well. 

Hatred and revulsion, actually. Which, we must assume, are the emotions 
which twisted Harry's face in the cave when, 'hating himself, repulsed 
by what he was doing', Harry poured the potion down Dumbledore's 
throat. The narrator tells us how Snape looks, we have to determine why.

If this does not work for you, consider also that in the scenario you 
describe, Snape has decided to cast the Avada Kedavra. We do not know 
precisely what emotions/thoughts are needed for the successful casting 
of the spell, but we might guess they would not be pleasant ones.