No problem. I think the point of the exercise was to match with uke so precisely that their balance was taken and they didn't have an opportunity to do anything but take the fall. In atuallity, I think that would only work with someone whose abillity is much less than your own, or if you got really lucky. So you had people grabing the arm, locking (as you mentioned) before the turn, etc. When doing what we call 'aikinage' we usually use both arms for the throw, which gives you the abillity to lock the arm and enforce the throw. Utada Sensei specifically asked us to try the throw without that, so we could focus on the timing aspects.
And if you look at all the pictures, you might notice that I did get my feet right, at least once...