Quickie Q: Anyone care to explain Slowdive's "Machine Gun" ?

https://www.youtube.com/watch?v=FAPKM0RZ4as
see you walking and i know shes my friend, again
just the weight of the water drags me down, again
guess i'll think of the water its my friend, oh yea
it's just the way that the water makes me feel again

son of sheba i saw him drown
son of yellow i saw him drown
it's all i need yeah

(repeat again)

I really lack the patience to do any Biblical referencing research, and see absolutely no relevance to the song's relevance to a machine gun... any theories?

lots of drugs

^

worth noting perhaps that the album this is on was named after a particularly vulgar Jerky Boys bit.