User blog comment:IamJakuhoRaikoben/Chapter 446: The Land Abandoned By God, Review./@comment-4449950-20150727052528/@comment-4829046-20150727071713

So... you don't think Gray's Ice, which is able to deflect a massive amount of damage, is stronger than Glass? And yeah, my point exactly. Azir was easily able to escape. If it was Glass, he would break it all the same. Unless there is some bullshit where his sand has particularly strong minerals that make the glass harder than Dragon Scales.