In 18w22a, players that sprint-swim up to, and are blocked by a block above them, take damage. Cods only occasionally take damage by slamming their heads while fleeing from players. Here's a visual representation: https://www.dropbox.com/s/oeforixer3ru1ub/Roof%20Clipping.mp4?dl=0
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The link no longer works.
Due to my schedule in school, I didn't have the time to post this report sooner, but I did test it in 18w22c.