One of the heroes is facing off against two armed thugs in a traditional fantasy setting. She has a sword and is moderatly skilleed in it. Her primary opponent is also armed with a sword. The other guy, who is currently menacing the hero's mage companion, has two daggers. Neither thug is too interested in killing the heroes -- they will only if they think the hero is too threatening to easily take down.
So, anyways, story calls for hero with the sword to be injured by one of these guys, preferably in a way that is serious enough to take her out of the fight for the most part, but not to serious that she either loses consciusness, can't be moved without further injury, or won't survive for the 10-15 minutes it will take for help to arrive and get her to a doctor.
EDIT: Magic exists in the setting, but it will just speed up healing times. The hero is lightly armored -- she has a leather vest and guards on her forearms.