Incidents such as this are in fact becoming more or less routine in Sweden and this one is only mentioned here as Mrs. ΛΕΟΝΙΔΑΣ's blog colleague posted on it here The comments thus far reveal what we here in the US might find rather astonishing.
First, your humble host is rather pleasantly surprised that the six gallant would-be rescuers were not arrested as is often the case when a victim has the temerity to mount a defense against a criminal assault. They were probably spared prosecution due to the seriousness of their injuries. Secondly, nowhere in the comments or the news article is the possibility broached that the item pictured below, judiciously brandished, accompanied by the will to use it, would in all probability have precluded the necessity of visits to the emergency room.
You, gentle reader, might consider this incident the next time a politician such as Mr. Schumer, Mrs. Feinstein, Mr. Lautenberg, Mr. Obama or the venerable ACLU assert that the language in the second amendment protects the " right of the STATE to bear arms".