[quote=@Crazy Scion]
Given the nature of RP fights. They would be ripped to shreds for being NPC's. So they are doomed to die if they interfere. 
[/quote]

Nah, not if you're smart about it.

Couple archers waltz over and start firing at your opponent while you're in combat, opponent is forced to dodge and probably charges archers with killing move planned, you intercept and stab in back, victory.

They'd provide a very good distraction.