[GAMEPLAY] Intermediate Nocturne Bot Walks Through Anivia Walls (Co-op vs. AI)

Is this normal? Did I see this wrong? I don't have a video but it looked like Nocturne Bot walked straight through a couple rank 1 Anivia walls. I'm not sure if I can reproduce this easily because I think getting Nocturne bot is random and getting others to cooperate may be difficult too.

1. Join Co-op vs. AI (Intermediate), Summoner's Rift
2. Pick Anivia
3. Put Nocturne Bot in game
4. Place rank 1 wall behind Nocturne
5. Get Nocturne to run backwards
6. Watch Nocturne walk through wall

These are end of game stats if they help: http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2270634500/271432?tab=overview

This is the first time I've seen it. Hope I'm not wasting anyone's time....