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I was playing a blind pick game as Pantheon on twisted treeline, and me and the other team both had a hard time seeing my ult circle. If you put his ult on top of the altar you see the little circle as it expands but then as it gets bigger you can't see it anymore. So you have >.5 secs to recognize my ult is coming and get out of the center. Not sure if it's a bug or not but it is kinda hard to see, and I felt bad for the other team not being able to avoid it.