A crown prosecutor criticised the conduct of bouncers in Grantham following a “melee” in the town centre.
Brother and sister Liam Aston of Heathfield Road in Grantham and Clare Marten of Hillingford Way in Grantham both admitted a public order offence for their part in a brawl outside Gravity bar in Westgate, Grantham.
One bouncer attempted to headbutt Aston, 22, during the fight which was captured on CCTV, the court heard.
The footage showed Aston being denied re-entry to the bar before trying to force his way inside and being pushed to the ground by bouncers.
Tracey Ross, prosecuting, told the court Marten, 25, reacted to seeing her brother pushed to the floor by throwing punches at door staff.
Miss Ross added: “To be fair, the door staff are part of the melee themselves, albeit to a lesser extent.”
Miss Ross said that Marten herself was then pushed to the floor, causing Aston to return to the fracas, throwing punches and “high kicks”.
Miss Ross told the court: “One of the bouncers does try to headbutt Aston at one point.”
Police then arrived at the scene and arrested the brother and sister.
Miss Ross said: “I would say both sets of parties are to blame.”
However, she added that police decided to only arrest Aston and Marten.
Stuart Wild, defending, agreed that the bouncers were partly to blame for the trouble.
He said: “Having seen the CCTV, the door staff do not do themselves any favours by their actions.”
Mr Wild told the court the siblings were out celebrating their mother’s 50th birthday. While he conceded both were drinking he denied either were “totally out of it”.
The pair were each fined £135 and must also pay £85 costs and £20 surcharges.
Mr Gordon added: “We don’t expect to see either of you in here again.”