Pantheon passive block cannot be heard when he ults

Reproduction: Pantheon has his passive on. He ults. I basic attack him My basic attack gets blocked and i wonder why I look at replay and see his passive was on but didn't make a sound when it broke

I don't know if it matters but he used the Dragonslayer skin. Also, i dash w-ed him with Illaoi, and he was in a bush.