Lost a Tire...quick question

Woman hit something last night. Puncture in sidewall right near rim lip. I don't think these things can be plugged or patched???

Anyways, it's a winter tire, so the summers are going on for now., but the question is can I just order one winter tire or should I go for two? They are dunlop Graspic's. the Tires are only about 10,000kms old. I'm thinking I should probably just get two and have a fresh pair for next winter, but I'm hoping the AWD doesn't get pissed off if there is a small difference in size of tire due to wear on the old ones?
 
well at my local town fair tire they always have deals like buy 2 tires and the align and balance them for free or something like that... so i would think getting two would be best.
 
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