I would believe that the very act of running away would establish probable cause. If you were already running, after the bus lets say, then there would be no probable cause. However, this would only be relevant in determining what evidence can be allowed at your trial. The police’s job is to apprehend the accused so they appear in court to face their charge. The guilt or innocence is irrelevant. As most defense attorneys would say, “ I love the police, if they did not do their job, I would not have any clients.”
Scotus says one can walk away from police. Someone could be running away for a diferent reason. If they dont appear to see the cops and run away it is different than someone who clearly sees the police and then runs away. I could see in the latter case an officer believing they have probable cause.
But if someone walks away they may be eaf or didnt know the police were talking to them, or did hear them and did not want to talk to the police. i csn envision scenarios where I would not decide to stop and talk to police. if you are not involved or a criminal you don’t have to unles they can detain you. Then you ask to leave.