Need some help on a Slayer riff if anyone can provide it. Not the most challenging or technical stuff out there, I know, but one part in particular has always flummoxed me.

At about 1:44 in "Fictional Reality" after the second chorus, the song slows down and there's some whammy bar wailing on top of a couple sustained power chords that shift chromatically, but there's also something else. There's this warbling that sounds like two-handed tapping on the low E string, but I'm not entirely sure that's what it is or how to play it. Any tabs I've seen don't sound quite right, either.

It's either a very fast trill or tapping, like you said. Either would work, but the tapping would be easier at such a high speed.

^ I'm almost certain that's what it is, it's just determining the specific frets and pattern if there even is any. If you or anyone has suggestions or even guesses, I'm open to trying them.