Of course he wouldn't show anger, unless he wanted her to see him angry and make her suspicous. I too think it was a punishment, I'll copy and paste real quick what I wrote in anoher thread about it:I thought Arya's blindness was a temporary thing, don't get me wrong I wouldn't be very surprised if it were permanent, the kindly man for being kindly definetely has it in him and likely wouldn't think much of it. But still I thought it was a punishment for killing Dareon (The bard, I think that was his name), if she hadn't been able to see she wouldn't likely have been able to seek out the Beggarmans dock (or whatever it was called) where other people spoke her native tongue, she also wouldn't have been able to see Sam and Dareon's back clothes and wouldn't have identified them as she had as brothers of the nights watch and then she most likely wouldn't have killed him. But still there is a flaw, I am not sure she will still be able to sell her oysters and stuff anymore nor cast off the boat every morning as she had been accustomed to doing. Now at least she will be forced to learn the new language in order to survive really. I hope this all makes sense, words have a way of failing me sometimes.
I also have to agree on many points with AryaUnderfoot about Sansa, my view on her is she has been through so much and brutallized by one she once admired and thought she loved (Joffrey), these experiences have made her retreat so far into herself is it any wonder she does what she's told? Her beauty making every man want to rape her hasn't helped much either. Once she breaks free of her shell though she will be one to reckon with, even in ASOS her potential is beginning to surface, soon she will surpass Littlefinger at manipulation of people and keeping secrets. About her revealing Ned's plans, how could she know it would lead to his death, she was told very little and had not yet seen behind the masks Cersei and Joffrey showed her. She reminds me a lot of Malt (or something similar to that from Robin Hobb's Liveship books, she starts out a spiteful brat but through hardship develops into a loyal and stong woman). Besides how long do you think she would have lived had she benn as rebellios and headstrong as Arya, Joffrey would have tortured her all the more to break her spirit and Cersei probably would have had her killed or maimed to break her dads.