The Problems with the DH movie.

[Carol]

Carol earlier:
> 
> > As for why Snape does nothing, he could have saved his life through an act of cowardice, screaming out that Draco is the true master of the wand, but he remains silent, protecting Draco to the last. 

Eggplant: 
> I have no reason to believe Snape knew Draco was the master of the Elder Wand, no reason to think Snape knew more wand lore than Tom Riddle Junior. <snip>

Carol responds:
Tom Riddle, unlike Snape (a Dark Arts expert), didn't grow up in a Wizarding household. Snape would at least be familiar with the Elder Wand from Tales of Beedle the Bard, as Ron was. Voldemort knew only what Ollivander told him. And Snape certainly knew that Draco had Disarmed DD. He becomes very pale when he hears that LV has taken that wand from Dumbledore's tomb. That seems to be the moment when he hears his death knell.

That aside, how do you account for Snape's unwillingness to defend himself if he isn't protecting Draco? Do you agree with the part of my post that you snipped? 

Carol, just curious