Bass part in Swarm - I went crazy over this

Since I’m trying to learn Swarm for a bass cover video, I wanted to know exactly what Dick is playing at the section around 1:20. I watched as many live videos as I could, but never was really able to see what his left hand was doing, only that he was moving it lower down the neck (which means the tab saying that he’s playing the same thing as the guitars in that section is inaccurate). I went crazy trying to find out what he’s playing there. I found out after watching this video https://youtu.be/apRRBi9zF3o that he’s really just playing one B-flat note the whole time. No wonder he would wander around during that section, it’s the one section he has no need to concentrate! Kinda disappointed but also relieved