I made it a YouTube video because I hate not being able to rewind or slow motion the demos, and also, because I'm too lazy to move files and type commands lol. Plus, it's in 1080p60!
Anyway, I feel like he was able to hide it by using the MP5 horribly, but he does track people through walls too perfectly, and sneaked up on me with C4 while I wasn't moving, and therefore, not making noise. Also, thank you for posting the demo, I was really curious.