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It happens quite often that when Nidalee turns into her couger form or back again into a human, that, during the transform animation, she turns around. That is problematic as when you activate an ability right after pressing "R" it might fire in the opposing direction.
It most often happens with Pounce (generally the pathing is problematic making pounce hard to use when walking past minions as you never know in which direction Nidalee might turn). But sometimes I also managed to fire off the Javelin in the wrong direction after reverting from couger form and that is a directed ability. Still, it flew into the direct opposite direction than the one I clicked.