I was under the impression he ran because he was illegal.
But, yes, I forgot about it until recently.
Did he stop?
He was never challenged (in line with Met Police operational instructions for dealing with potential suicide bombers), so running or stopping were not even relevant.
The initial story had Menezes wearing heavy clothing, being challenged by police outside the station, running into the station, jumping the ticket barriers and running down to the platform. Precisely none of those things were true. He was wearing a denim jacket and CCTV video shows him entering the station, picking up a newspaper and using an Oystercard to go through the turnstile before walking towards the platform.