The situation you've outlined still carries more risk from multiple attackers
Any risk present comes
only from those attackers who are in a position to attack. If you move to put one of them between yourself and the other three, the risk is only 1. Adding more attackers does not immediately raise the risk level by that number, or anything, unless you let them get close enough to present a threat.
the two remaining may or may not run but there is a level of risk from them.
Again, so long as you control the fight, you control that risk.
Taking it to a silly extreme - how about 100 swordsmen vs one guy with a staff?
In theory, the same applies.
So long as the staffman can keep an eye on all 100, or at least the general mass of incoming bodies, the science holds up.
Chances are the physical limitations/endurance of the staffman will come into play and there's likely a diminishing return the longer he has to travel to move around the body of 100 - ie, if they're all in a line and he starts off in the centre, that's 50 people he has to pass to gain position and he'll likely lose position as those on the end close round. If they were in a circle, however, his chances are far better.
It's also one big reason why polearms were a better weapon than swords on the battlefield.
I'd still not want to try that many by myself, though!
It apparently works from the other posters explanation by using some to block others. However if that is the case and we're talking about 'trained' swordsmen then presumably they've trained to fight against people with staffs and so should collectively take an action that increases the risk to them.
Training against staves is mostly an opportune thing, really. Assuming all things being equal, the staffman will utterly thrash the swordsman every single time. Same for sword against knife, Longstaff against Shortstaff, etc etc. many of these principles are also what allow the staff to dominate the space and control multiple opponents.
But things are rarely equal and psychology plays a big part in all this, as do physical and mental fitness, technique, levels of training and experience.
Before someone says something about being off-topic: In essence, it's why I chose a billhook - You gain some distance on the bear and a lot of power, you dominate the space against the two gorillas and you gain some speed against the wolfpack.
Blimey, there is some proper "big boy" rubbish being said in this thread... surprised no one has come out with the old "Katana is better than a European Sword" crap yet... lol
I know, right!!
As if a weapon designed against light wooden armour and grubby peasants is
any match for a Knightly blade!!!