I wouldn't go to the vet just yet, and bandages aren't great on animals anyway, they can encourage infection. If they can pin it down long enough, clean the wound with salt water and then spray anticeptic if they have any. Clean it every day with salt water and just keep an eye on it, at the first sign of infection (any swelling or pus) then get it straight to the vet for an antibiotic injections. They're pretty resiliant creatures, tell your friends not to panic, but keep it clean and keep an eye on it.
having said that, If the cut is so deep that the tail is hanging off - get it to a vet!!