Played several rounds of Champion as Slayer Bardin.
Sometimes when the Purple bar is visibly seen as full, hitting F does not activate the targetting impact circle of the leap. Teammates were downed and I was trying to leap in to save them but Ult would not proc.
Leap is a pretty short cooldown, so it’s not a visual problem. Leaving it alone for a minute or two did not resolve the issue. Eventually it would work again but only much much later.