It's not as apparent on the LivePhish remaster of this show, but if you download the version played on Kevin Shapiro's From The Archives show at Big Cypress, Fishman's vocal is turned up in the mix to humorous effect. You can hear him starting with the "Paid Satan" line in the 2nd verse, and then a screeching "yeah yeah yeah" during Trey's first solo, before helping out on the final chorus. And of course, he kills it on the drums throughout