It's location desync. The server often can't accurately determine the position of two players in relation to each other, which is especially noticeable when using un-targeted conal abilities like dawnbreaker.
The ult has been becoming increasingly less reliable for years now. Wish they'd make an adjustment to the radius to bandaid the issue.
gariondavey wrote: »Post clips please
itsfatbass wrote: »Probably woulda hit them if the player was behind you LOL