I think they thought he had a bomb strapped around himself and any pressure could set it off. Don't ask me why they pinned him though.
I don't mean to sound inconsiderate but it was kind of his fault for getting shot. Firstly, he jumped over the ticket barrier with no intention to get a ticket. He then ran to the platform and ignored the police when they told him to stop and get down on the ground. He then broke into a sprint and tried to get on the train. Leaving the armed police no choice but to shoot who they thought was a potential suicide bomber.
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