I’ll note that Jon says, “Another big song at camp, or at least it was when I was young, but these things go in cycles.” I’ll also note that the lyrics Jon sings to this are markedly different to the sets that I can find and a might more salty. Mainly Norfolk covers Lloyd and the Watersons (Folksons) and mentions Bellamy’s version, which also pretty much follows the same line as those two. So I was at a bit of a loss to explain where Jon’s words came from or indeed the sense of this shanty. I’ll refer you to this Mudcat post as it’s interesting (if slightly wayward) in terms of the rhythmic and the work element of the song. Other than that, I can only cop out and say that many shanties seem to have any number of variants and probably changed at will. Further searches at Mudcat have revealed all manner of debate about the meanings and origins of “Go down you blood red roses.” I’ll leave that to your discretion as to how much time you have on your hands, but if you can add here, please do.