Water cannon can definitely break glass. It can also definetely kill as wellDamn I didn't know water cannon can break glass. I thought it was more akin to a car wash/fire hydrant.
While some say that water cannon is a non-lethal tool, I think a more accurate term would be "less lethal"
Keep this in mind next time you see drone or aerial footage of a boat getting slammed by water cannons. The equipment as well as it's sailors can be damaged and/or injured/kill