[Gameplay] Headhunter Nidalee Spears

I was playing an ARAM earlier today as Alistar and my friend and I were duoing and the enemy Nidalee's spears were nearly invisible. We could only see a very slight, red line when she was throwing them. I don't know how to replicate it and this has been the only occurrence so far that I've seen but I still think it's worth noting since it was an annoying feature that made gameplay a bit difficult.