User blog comment:IamJakuhoRaikoben/Chapter 446: The Land Abandoned By God, Review./@comment-4449950-20150727052528/@comment-5303512-20150727072615

@FTGM, well you could see Ice breaking when Azir was jumping off the golem.

It's not about if Glass is stronger than Ice, it is about the basic chemistry that Fire or heat can turn Ice to Glass.(I will be honest that it doesn't look like he can turn his body to sand, but he can turn objects like Swords into sand.)