Rob Knox, (right), was trying to protect his brother, the court heard
The alleged killer of Harry Potter actor Rob Knox drunkenly harassed a woman shortly before the fatal stabbing, the Old Bailey has heard.
Karen Jones, 18, said Karl Bishop, 21, demanded a kiss and tried to drag her away from the Metro bar in Sidcup, south-east London, in May last year.
Miss Jones said a friend warned her Mr Bishop was "coming back with knives" before she saw him stab two people.
Mr Bishop, of Sidcup, denies murdering Mr Knox, 18, and five wounding charges.
Mr Knox, of Swanley in Kent, was stabbed five times outside the bar as he tried to defend his younger brother Jamie from the defendant, the court heard.
Mr Bishop, of Beaver Lodge, Carlton Road, said he was acting in self-defence. Five others were also stabbed in the row.
'Back with knives'
Testifying, Miss Jones said: "He was asking me for a kiss and I told him no and he still wouldn't leave me alone.
"He pulled me by the arm to go away from the Metro bar but I was holding on to my friend Alice's hands.
"I gave him a peck on the cheek so he would leave me alone but he said 'I want more than that'.
"He was quite drunk. He couldn't stand up straight, he was stumbling."
Soon after this she said she saw him fighting with Mr Knox and his friends and a friend warned her "he's coming back with knives".
Miss Jones claimed the defendant returned and stabbed Charlie Grimley and Dean Saunders, Mr Knox's friends.
She said: "He just looked like a normal person walking down the street making out that nothing had happened and then he did that."
Later as she waited at hospital with Mr Grimley they saw Mr Bishop.
"He was sitting in the ambulance laughing like he wasn't bothered.
"He was like, 'I don't care, I've been in there before and when I get out I'm going to rape your mum'," Miss Jones said.
The trial continues.