Most of bike crashes in the city, are caused by a driver who did not see anything. That is all they know to say: I did not see him. This is not always true, some of them just believed they could pass before you, and decided to bet YOUR life on it. On 2 wheels in the city trafic, you can't trust anyone. Your safety is in your own hands and any vehicle is a potential threat. Unfortunately, the learning of this fact does hurt and kill many riders every year.
Even when you are conscious of all the risks, you never know when some unpredictable situation will happen. Dealing with the unpredictable is the most difficult task for a rider. You need to watch for every possible evasion solution at all times, to be ready when the time comes. It does require to remain calm in a moment of extreme stress, to make a series of quick decisons, and to have mastered the skills to apply them in rhytm.
This particular situation when someone does a left turn in front of you, does happen very often when you ride a lot of mileage in town. It is predictable and you need to ride every time like it will happen. This means, when you notice someone oncoming planning a left turn, slow down enough to be able to turn with him if he does it suddenly in front of you. I can't count anymore, the number of right windows that I have broken with my left shoulder in 50 years. Sometimes, it is just too late to slow down and this is YOUR mistake for failing to anticipate. Braking then, would leave you without any control on the inevitable crash. As a result you have to select the best crash quickly, and do it without any fear or hesitation. Never presume that you can time yourself to pass behind them, for many idiots will stop when they finally see you coming. If there is trafic in the oncoming lane and you can't clear behind the idiot, best is to target his front wheel and jump off the bike just before the hit, to fly over and go taking a slide on the other side.
Sorry to have avoided the usual words about the poor guy who died. I figured out I might try to save another instead.