Well, I'd be likely to think so, it's just that it came to me really weird how exactly same divergence it was.
The map version is not possible while I was aiming in both cases from the blue side to the red side and from bottom part of the screen to the top part. The portrait version I don't understand - is there an interaction that if you click with skillshot to the portrait of a champ, it will shoot in the champ's direction?
Also I think it's like VERY rare interaction, might be kombination of many factors (as I mentioned, Varus is slowed from another source + he's aiming in the upper right corner (ca.) of the screen...? I would test it, but honestly I don't think it's possible for me to catch the possible bug intentionally with my resources, thus why I'm asking if there is anyone other who experienced the same.
Thanks for response anyway.