I know the Arishok totally has a pocket watch, LMAO. He was probably checking it while you and your party were waiting for him to make his appearance and going "heh, fools..."

I usually tend to think elves in general have keener senses than humans. That may be from the Tolkienite in me, however, since in Dragon Age it really isn't stated. Still, there seems to be a fundamental difference there that elves have a bit more grace, prowess, capacity for agility. They just look like they are built more agile and to me that makes me think they probably have keener senses as well. The ears of course are obvious.
As for science and magic. Hmmm... I don't suppose magic could cure deformities. Then again, if a person was born blind, or crippled, why could magic not heal their eyes? Healing would be all about connecting to a spirit in the fade and returning the deformed or broken or diseased part to "normal" anatomy. However, if it *is* your normal anatomy, would it correct it to some standard anatomy? I'm not sure. It may just be limited to correcting degenerations/abnormalities from the individual's anatomy.
Also,
Fenris's most interesting conflict is between his desire not to be alone and his desire to be free and completely self-reliant. Every time he does something to join himself to other people, there's a bit of him standing off to the side saying "you idiot, you'll regret that later."
This is one of my most favorite character traits about Fenris. It is much like myself, and I really dialed in on it when I was watching his character. The fundamental loss of trust and belief that "everyone is out for themselves," and yet "no man is an island." That inner struggle he constantly endures is something I really enjoyed in the character.
I MUST do a Code Geass quote here: "There is a part of you that is a critique, constantly watching your own moves, and there's another part that is an observer, watching the critique, watching you. Your that kind of person." Fenris really is. There is a part of himself that is constantly judging and weighing options, and another part of him that is screaming out how bad an idea it is to trust anyone.
Fenris constantly talks about wanting to leave his past behind. Wanting to move on. Wanting to get out and be on his own and free. Yet, his past haunts him. Just when he thinks Danarius isn't coming, has perhaps not found him, and he is able to relax a bit in Kirkwall, Hadrianna shows up. It is a huge wake-up call, and he is so justifiably angry. It is such a personal reaction, and a very real one. That is another thing I do love about Fenris. He has very real emotions, and they are portrayed exactly as I think they should be.
@ CGG -- off topic aside: Vincent is my favorite FF character. Well, perhaps next to Tifa. FFVII will always have a special place in my heart. Sephiroth, HELLO? Cloud as well, though he isn't my favorite. I really didn't like the others after that. X and X-2 were meh, and XII well.. I couldn't get into it. Never played VIII or IX. Gahh, roman numerals... oh FF why do you test my knowledge of ancient counting systems??
@mcilhany -- perception is a funny thing, and can often be skewed on the internet. I'm hardly offended by you, and if we do have polar opposite views there is such thing as a rivalry, LOL. I am blunt by nature, and so that comes out in my internet self, but I'm not particularly vindictive or anything. I welcome you here as I would any other Fenris fan.