A Michigan deputy pulls over a guy suspected of stabbing an old man in a convenience store. Nice neighborhood. Then it all goes sideways really fast.
Notice at about the 0:35 second mark, her weapon jams and she is able to clear it and continue to defend. Notice also how she backs away, trading space for time. Her assailant continues to attack until he finally goes down. When he bends over, he's trying to pic up the dropped knife.
I don't know how many times she hit him, but she only stopped shooting when he assumed the universal "don't shoot" position when he became horizontal.