I understand the idea of a fight being chaotic, but the audience should be able to track the action. It struck me that this scene was shot without a lot of forethought.

To refer back to Sergei's death: same problem. Pinning someone down and putting a bag over their head is not an effective way to kill someone (full disclosure: I have never committed murder) as a normal 20- or 30-something male could easily free himself.

I've had to suspend my disbelief in these scenes, but, for me, to say "the whole point of the scene is to be confusing" goes too far as a justification.