I hope Nel continues right where he left off, and suggests that he did indeed shout that, but at RS.
Also - if he was scared, whispering, creeping up on an intruder... why then suddenly get angry and shout?
And why not say he shouted "I have a gun, I've called the police" or something else more believable?
And, yes, IF his scenario were true... WHY would an innocent RS, using the loo, not shout out - hey, it's me in here!!
Utterly improbable.
And I agree, all of his answers to every tiny detail are tailored to support his story. I don't feel like hes answering honestly about anything at all.