User blog comment:IamJakuhoRaikoben/Chapter 446: The Land Abandoned By God, Review./@comment-5303512-20150727051117/@comment-24367018-20150727093941

Well you say that, buuuuut unless glass is blown properly it'll just shatter creating glass shards, something Azir could still manipulate perhaps. As well as that, sand is often used to douse fires if there's no water available.