Under german law, it would be anyone officially acting as security on that property. (It does not have to be a professional security, it can be anyone from staf

Under german law, it would be anyone officially acting as security on that property. (It does not have to be a professional security, it can be anyone from staff filling in that role). The police does not want to be called, for every bouncer action. It can get into a grey area, if violence will happen, the security may not simply beat someone out - but grabbing and forcefully moving or carrying out is legal. But if there is serious resistance and the security unable to handle it in a nonescalating way, then they would need to call the police. But usually, the bouncers would just get brutal, then. Attacking security gives them some freedom to act. If other people are endangered by someone, very different scenario, anyone can (and must if possible) stop violence. Source: short stunt as a professional security