Two Plot Problems

[zgirnius]

No: HPFGUIDX 187662

> alla:
> 
> What tells us that it was a verbal spell? Quite sneaky if it was (if  
> it hadn't missed) — almost a hint to the Order that Snape's still  
> ambiguous, though compared to killing Dumbledore, not a very forceful  
> hint.

Zara:
It says so in the book. The incantation was not merely spoken, it was "shouted" by Snape.

I don't think any of Snape's positive actions in DH were intended as hints. It seems more likely that he was simply doing what he thought was best in those instances. I think he understood that his "murder" of Dumbledore amd his obvious alignment with Voldemort as the new Headmaster of Hogwarts would make much bigger impredssions, that nothing short of a full explanation would wipe from the minds of his fellow "good guys".