Roy Buchanan question?

About 1974-75 when the Stones were auditioning guitar players for Mick Taylor's replacement,Buchanan was drunk and pretty full of himself apparently..he went for a leak..and 2 miscreants pissed in his beer..Who were they?

I'm going to say Kieth, one - you KNOW he had to be one! and Either Mick or Bill , Charlie Watts wouldn't do that.