My point was that even if things went the way Polak wanted, he was putting himself in a situation where it's 50-50 that he gets him legally.
As for turning, you're missing my point. Sure, if Bjorkstrand continued he would not have been as vulnerable, but his primary point of concern must be making a hockey play, and not protecting himself from questionable hits. He must be allowed the opportunity to reverse the cycle without it meaning it's open season to board him. I think he had enough separation to do the reverse, so I don't agree with you there.
There's absolutely no reason for Polak to continue a hit that, even before OB turns, is a high risk play. He can let up, and it won't cost him anything. There's a very good reason for OB to turn, as reversing the cycle is the right play to maintain possession and create offense.
If this kind of hit is acceptable just because the player turned to reverse the puck, then we are taking a basic play out of hockey just because people can't control their aggression in 50-50 situations.
There's a time to mention people that turn, but this is not one of them. Polak was scrambling to keep up, and was even before the turn heading for a hit into the numbers. It's a bit different if the D-man is lining up a perfectly legal hit and get it disappear on him in the last second. Polak was already heading quickly into bad territory.