What really happened on the tower.

[potioncat]

No: HPFGUIDX 155684

ken: 
snip
 If Snape had returned 
> and saved Harry from Fenrir I don't think he could have been 
> as far ahead of Harry as reported or as close to Draco. You could 
> be right though, it just seems to me that "on further review" of 
> the instant replay that Harry probably handled Fenrir on his own.

Potioncat:
It could have been Blondy (Big Blond DE). He was casting all sorts of 
spells that only did damage to the bad guys. (I think he's on our side.)