I understand the situation, he comes running with something in his hand... you don't know what can do to her... I think that he had to go calm and ask Gaga for a photo or a signature and I'm sure that bodyguards didn't say nothing
The fan should not have acted that way. If someone ran at me like that I would sure be hoping I had a bodyguard just in case they were going to try and hurt me. She is a person too and needs to be safe and have her boundaries respected. It's better to be safe than sorry! We all want Gaga kept safe and I think her bodyguards do a wonderful job.
The body guard was doing his job. What if he was holding a knife and tried to stab gaga? If he really wants to meet her, he could have waited outside with the rest of the fans/paparazzi out there waiting for her. Besides, she always stops for fans anyway :)
The fan could wait outside like everyone else instead of running like a fucking aggressive cow into her, of course they're gonna guard her, that's their job. The fan could had a weapon with him, the bodyguard acted well. For example John Lenon was killed by a fan. You can't trust in everyone!!