Two things, and the second one is more important than the first;
1: I don't know what you mean by "normal lead tone" in this context. Most metal bands lean towards the "crazy" end of the spectrum, but by the same token many guitarists who play milder genres still have pretty "crazy" lead tones, so I'm a bit lost there.
2: Most gear demos on Youtube only carry small snatches of other people's music due to copyright concerns, and I think that may be why Rob and Bea only played brief excerpts of songs by Metallica and Pantera in this video. So asking for longer segments of copyrighted tunes might be impossible for them, regardless of who they were written by.