Just because a person who is walking in the direction towards the subway, starts running, it doesn’t necessarily mean that this person had seen the train coming and then started running.
It could simply just be that he’s starting his jogging route here.
So you’ll look pretty damn stupid when you start running past this person in complete panic, only to realise that you need to wait for six minutes.
A tip is to check the clothes. If they’re wearing trainers, they might not be on their way to the subway.