(GAMEPLAY) Camille Ultimate not knocking back

I've had this bug happen in a couple different games, and even saw it happen in an LCS match involving Echo Fox (though I didn't hear the shoutcasters catch it nor was the game paused, which I found odd).

When you hit someone with your ultimate, it should knock back any other nearby targets, correct? Nearby being any within the hexagon that is formed. Feel free to correct me if this was changed at some point unbeknownst to me.

I used my ultimate in the attached gif on Tristana. At the time of ulting, Master Yi, bard, and Teemo are all within range, and should be knocked back, yet seemingly none of them are hit by it. Yi does leave the area, but I'm not certain if he ran up or was knocked back-it's unclear. Still, even if he was, there's 2 champions unaffected by the ability.

The only thing I can think of is I was blinded during it-though it isn't an auto attack (according to the description) so this wouldn't make sense.

EDIT: Tested with a few friends. Blinding did not prevent knock back. In fact it worked both times we tried it-so it's not a 100% guarantee not to work...I'm not sure what the common factor is that stops it.