I was looking at the ELeague photos, and often in them you can see a 6th player in uniform on the side.
Who is this and what can he do? Its not a 6th player (games are played 5v5), but it seems that he can communicate with the team (you can see he has a mic). It's not a referee too, because he's in the team uniform.
So who is this guy, and what does he do?
Edit: Also, what does that team member have access to?