No pain sounds for certain Stage Ultras?

Why did IG not include the sound of pain in Hisakos Stage Ultra? Spinal is heard as he is dragged below but when the Stage Ultra is activated in-game no Character makes a sound! I was disappointed that they weren’t included, same with the Aganos Stage Ultra. In the other Stage Ultras there is a short grunt. Was pain sounds taken out of those two Stage Ultras because of the teen rating maybe?

There are pain sounds in Hisako’s stage ultra, but that’s only if you didn’t kill them first.

In Aganos’ stage ultra, they’re not exactly getting hit right? They just feel themselves turning into stone. No real pain or anything.