Elite AI Chromie sometimes shoots her Sand Blast in a direction with no enemies. Seen on PTR in a Versus AI game and then in reproduced in a Custom Mode game.
Screenshots:
https://photos.smugmug.com/photos/i-fk6DrW8/0/e8be65e3/X2/i-fk6DrW8-X2.png
https://photos.smugmug.com/photos/i-Jw9wW6q/0/9e014a1a/X2/i-Jw9wW6q-X2.png