Twitchy, prowling Snape?

[silent_ghost227]

No: HPFGUIDX 86141

Hmmm, I believe that Snape was nervous as a teenager, used to 
suffering curses and hexes, as opposed to casting them, when he 
reached adulthood. He wasn't well liked, and perhaps that didn't help 
the 'twitchiness' at all. Though one wonders, in regard to the theory 
of the death-eaters effect on him, what, besides the obvious reasons, 
drew him to Voldemort? He regrets it now. What did Voldy offer him 
that he thought so important? 

Back to the topic at hand, I believe he is more sure of himself as an 
adult, hence the change in the way he moves.