In your first demo he is literally standing right beside an admin... report these things to the admins in-game to punish there. In addition, he did not block the person or hinder them at all.
Onto the other two demos, they aren't showing the players name so really this could be anyone. Let's assume it is Stefan, it looks like it's the same map so I'll assume it was all at the same time, in which case there was an admin on the servers to handle it. I see nothing in your chat logs indicating you tried to contact an admin so I will not ban Stefan here.
Thanks for the report,
Lotus