Megadeth - Mechanix (Live)

Wtf? This whole song IS Metallica's "The Four Horsemen", with different lyrics and a faster tempo. Still... Dave Mustaine didn't really steal the riffs, he wrote most of the first album in the first place, so Metallica stole his music... Still... I had no idea this song existed, nor that Mustaine would try something so low. He doesn't sound like he's moving his mouth too much...