Leap of Faith

Jumping or being thrown through a glass window (aka being defenestrated) happens all the time in movies, especially Westerns. Normally, the subject dusts themselves off, adjusts their hat, and walks away uninjured. In the real world, being tossed through a window results in numerous life threatening cuts and lacerations.

Roleplaying games can vary between the two extremes of window hurlage being an inconvenience and a death sentence. I believe 3rd Edition formalized it as 1d4 damage, so it was dangerous at 1st or 2nd level but largely ignorable at high levels. Which makes some sense, but then you wonder how being skilled at fighting and deflecting blows translates into surviving shards of glass. Like falling, it’s probably one of those things it’s better not to think too hard about.