No disrespect against Megadeth, but it's this guy's session drumming background that is on display here. Session musicians are absolutely incredible at putting in cost-effective work. This guy has drilled for decades and this is just another Monday at the office. Totally awesome to see what looks so effortless.
It's stuff like this that makes me appreciate live music even more. A lot of people think that the way a song is recorded is the way that a song has to be. But then you hear someone else play a song and change something up and it sounds brand new. Was really cool hearing his take on it - and also super impressive that he came up with it that fast!