First I want to notice two aspects of their AI: 1. the fast short side movement and 2. sometimes when they came to you for attack they don't stop right in front of you; they passed you a little then turn for attack. Very nice!
Not far from Miraak's Temple there is a place(I don't know how to call it, but next time when I play I''ll give you the place's name) where they were gathered. Exploring Solstheim I ran into that place and I saw 4 humans sitting: 2 males and 2 females. So i approached to see what is there. Never crossed my mind what they really are. When I've got closer, I got the first warning to leave.
I ignored it, and walked around. I got another warning. I ignored that too(no intention for aggression from my part). Suddenly a male stands up and became aggressive. Guess what? They turned into werewolves.
About the frozen:
Well it's not frozen as magical effect. I used Unrelenting Force against him several times. The strong force thrown him away. When he wanted to get up, that is when happened. In other words he got stuck in that position(like a baby in the womb). Same happened when I used the Fire Fist. The force knocked him down and somehow he ended up on a side on the ground. At this point he got frozen(stuck), but not in complete freeze like first time. His legs were moving in the air as he does when he is running, only that couldn't happened because of this weird position. Also his arms attacked me (or tried to) when I got closer. I don't remember quite well, but second time I think that he regained the stand pose with a little help from me. The first time, the situation got back to normal by itself. Unrelenting Force didn't have any effect while he was stuck.
About the Forces effects, the weak force didn't affect him at all. Unfortunately I don't remember about Fus-Ro.
Please reconsider the immunity to Strong Unrelenting Force.
In my opinion the shout is so powerful that even the dragons should tremble under the power of this shout. Of course, this is my opinion. Anyway, I have other powers...HeHe!
The horizontal movement is running like a wolf, a dog. I especially wanted to test this behavior, so I took distance to see. And he came to me running like a regular wolf. Only a few steps of course because of the short distance(the beast is kind of big). I couldn't go to far because he could have left or start searching for me.
Things were like this: I thrown him away with Unrelenting Force then I took some distance, the Werewolf stood up, made his howl, turn to me, starting in two legs, the ran on all four members( the most part of the distance) and again in two legs when he was close.
Never saw a Werewolf running in all four members? It's more impressive the seeing one running in two legs.
When I first arrived in the forest I found him chasing some wolfs.
I watched. I saw then too.
I just found out about their horizontal movement.
That's why I asked: "I will see this behavior in game: running on horizontal finalized with a jump with bite or knockdown?" To see this kind of attack will be awesome.