EXACTLY. Even I can tell you what their strategy is; surround you, watch while you're eyeing to see who's about to rush you, one does but it's fake out, then one outside of your flank hopes to get a stab in on you to weaken you for the others to finish you off.
SIMPLE.
The unsullied are NOT bitches, the Sons scope them out to try make the number 5 to 1. And like some else mentioned, the Unsullied guys have spears - in close-quarters which is NOT good

. You might ol Prince Martel used a spear in his with the mountain - but he had, like Bruce Lee said, room to groove out in the open. Probably not the same when you in an alley with wall that limit your maneuverability.