He jammed on the riff a little bit, and "it was just one of those things that happened magically. ... A lot of times I'll sit down and the shit will just drop into my hands and I don't even think about it.
He improvised on the riff a bit, and "it was just one of those moments that happened effortlessly. ... A lot of times I'll sit down and the ideas will flow into my hands without me even thinking about it.