I think this is both a very non problem (in this case especially), the crowd was completely silent for long enough, jawgemo is standing against tuyz and not making a sound for at least a full second (which might seem short, but in game it is an eternity). but eventually the energy becomes to much to contain and there is going to be a reaction. it is part of the environment. if you want to get rid of this, you also get rid of all the upsides of the LAN experience.
but also if you watch the full clip, jawgemo doesn't even see tuyz until he goes to check his flank (which is seconds after the crowd makes noise) and then he does a double take because he was clearly surprised by the fact that someone was there so his crosshair was way past that corner to shoot tuyz