Nasus Q and Pantheon's shield

Hi,

I was playing Nasus in an Intermediate vs AI Summoner's Rift game and I was against Pantheon. I used Q on Pantheon while his shield was up and the damage was dealt.

I'm basing this off of memory and unfortunately I can't replay and watch the game because replay mode view isn't an option in Coop vs AI game modes. I can't verify if I'm just misremembering this or, the Camille that was with me already auto-attacked Pantheon prior to my Q as Nasus and maybe I just saw it wrong.

However, maybe check it over and verify if this is actually the case?

*Nasus's Q shouldn't have damaged Pantheon while Pantheon had the blocking mechanism up to block auto-attacks and turrets.