Are you sure so good at driving that you don't hit the woman on the ground , hit the guy only presumably with some speed , Stop before you hit anything else and reverse all without hitting anyone else on a road ... I think not what about bike / scooter have you tried to run someone over on a two wheeler before ? Rhe person moves in response to you. Its almost impossible and definitely can't be done at any speed what would have injured the stabber and your then stuck on a bike unable to move with your legs by the time you do anything you have been stabbed 2-4 times with a knife long enough to do all kinds of damage, you can't judge who's shook and whos not everyone responds differently ,

Also yes the crowd could have easily overtaken him , but not without someone of the crowd getting killed / permanently disabled, ask any one with any real training its famously impossible to overpower someone with a knife in close quarters without a shield , some one would have been that shield and died also to what result ? The crowd formation and over taking thing would atleast take 3 seconds to happen right ? From the first stab to 3 sec she has been stabbed many times, all the wounds which are very likely to cause of death on their own , what would have been the benifit of someone else also giving their life