Its never easy for dealing for someone with a nosebleed, as sometimes you get some people who will stick their noses in whilst you are trying to treat. I normally find a way around this... I firstly would remove the casualty from the room into another room and sit them down then, I would get down to treating them in the standard way.. it is not something you would consider calling 999 for, unless if it was a serious bleed or if there was a fracture involved...