Psuedo-stunning yourself as gnar?

This weird bug happened to me just a bit ago, engaged on a katarina as gnar in mini-gnar form, transforming to mega by jumping, which in turn kinda stunned myself not letting me be able to use any of my abilities (heard spamming r in video) i dont know what caused this and it didnt last forever (could use abilities at the end, but it was too late)

I hope im not just being dumb and this is an actual bug lol..