Stratford station London, A red jacket wearing man vanished into thin air.

This is the first time I ever saw this happen, I was taking a regular commute home from work, this was during rush hour, I saw this man wearing a red jacket walk through a closed door, this door is used to let passengers off the train before allowing new passengers to board the train. So the doors are closed for people trying to get on the train but this guy wearing a red jacket walked through the closed door like it wasn’t there, I could see people on the other side of the door waiting for the doors to open to let them through, but this guy just walked through like it wasn’t there, his whole body was visible as he walked through until he was no longer visible, the doors were still closed.