Ok so?.. it was only on for one round and its behind like 4 rounds,none of the players were looking and BLAST staff have access to a different set of cameras that show the players from behind and couldve seen if they were doing anything malicious which they werent
Such tryhards gathering in corona times while having a small army inside the room they play in, half of them always on their phone probably watching the stream too. Vitality was also watching their game stream when they played Cologne last year btw.
They explained that they want the closest experience possible to LAN. So there's the entire staff there + other people and they are invited to make noise too, to cheer etc ... So when LAN comes back they won't be all disturbed by the presence of admins, staff, cameramen, etc ... It's a little detail but that's kind of cool.