Swain particle glitch - flying purple trails/bird across the map

I'd take a screenshot but League doesn't want to cooperate with printscreen or some reason (I always get a giant black box) Anyways, I decided to go into a custom against a Swain bot to just test out my ping (and stayed to figure out how to aim Karma's Q to clear waves) and after awhile I saw purple particle lines appearing over the map. Asked other people if they've seen the same thing; I know sometimes when something new is going to go down, there will be little "easter egg" things going on. I noticed the purple and particle looked just like Swain's bird toss thing, and then I realized that occasionally the purple lines would have the birds on them! I have no idea what was going on, but it occurred throughout the game until I left it.

I don't think it's a Xerath-level exploit since it didn't seem the bird things really "did" anything (I'd sometimes see them when Swain was dead, too), but I thought it would be worth mentioning.