1st replay ~ Can hear staff jumping which is why he moved.

2nd replay ~ Doesn't work for me. Anyone else have this issue?

3rd replay ~ Uses Audio Queues and is watching allies die so he can tell where staff member is coming from.

4th replay ~ Host is giving away tons of Audio Queues. Every time he lands from jumping he is making a noise.

Overall ~ I see nothing suspicious. Noises give away your exact location unless you are hang jumping. many players use this to gain an advantage in such events. aswell watching how your team mates move helps give even more information.

I will leave this here as my other colleagues will be leaving their opinions.