You are in the wild, there is nothing else
You see slave traders on the road
They have your husband or wife captive, you finally found them again
If you attacked you would surely be killed or maimed in the scuffle...

What do you do? You have no money. You have no influence. You have no numbers. All you have are primitive hand weapons, and the customary dress of the people you are among. The slavers and you do speak the same language.