白羽（baiyu）

For those who doubt who the horse is referring to:

My main recollection of Lennox Gardens is a rather chilling thing, being at John Dunbar and Marianne's house when one of their friends came around who was a heroin addict. And we are in the corner smoking a little bit of pot here. And he is over there, and suddenly he pulls out a big red rubber tube thing and he tightened his arm up, putting a tourniquet on. And he's tapping, and he's got needles and he's got spoons and he's got a little light. And I'm going, 'Uhhhhhh!' You get the kind of shock of horror through you, I thought, 'My God, fucking hell! How did I get here? I'm in a room with a guy who's shooting up!' He had a big rubber tourniquet, which smacked to me of operations. I'd always been fearful of red rubber as a kid. And me mum was a nurse, so enemas and things, it was all red rubber. Very frightening sort of thing to me, not pleasant at all, that shit. We couldn't look at him. — Paul McCartney, Many Years From Now

McCartney told me that he didn’t have many pictures of his mother, although he recalls her approaching him with a red rubber tube and a bowl of soapy water telling him it was time for an enema. “I was crying and begging to not have this torture!” he said.  — “Paul McCartney Doesn’t Really Want to Stop the Show,” David Remnick, The New Yorker (11 October 2021)