i just saw them live at mayhem fest last week. killer show, but while listening to his bassline during 'angel of death'...
http://www.youtube.com/watch?v=wU2fPNhRi2Y
listen to the guitar riff that starts at 1:38
at 1:49, you can hear the bass kick in, and he begins playing the octave jump riff, which descends by halfsteps
if you listen to the fill at 1:52, you can hear him playing straight Eb eigth notes
but at mayhem fest, he just playing straight Eb eigth notes throughout that whole section. which i thought was weird. oh well, all things considered hes a great performer, the fact that he does good quality vocals while keeping up with 2 of the fastest guitarists in metal is impressive
and for those who are interested, he was talking about a new album this year...