It would unintentional/preventable because you killed someone while driving, which was untientional, and you were drunk, and you could've controlled that so...
Being hit and killed by a drunk driver is an unintentional accident. The driver did not intend on causing anyone harm, it was not premeditated. It was preventable because no one should drink and drive. The driver should not have been drinking therefore the accident could have been completely avoided in the first place.
If he sprained his ankle and you know he's n pain, then you should see the doctor or make an appointment. If the injury is severe then take him or her to the emergency room.
