His "shield" already filters it out period based on the characteristics of what tried to get through to him.My guy. If his shield blocked sound, ALL SOUND, he wouldn't hear shit ever. Someone talking to him normally doesn't obviously get blocked out since he can hear people. By the time him or his shield realize that what he heard was an attack he would have already been subject to it.
You cannot equate a magic attack to just someone talking to you. That doesnt work
By the time it reaches his senses it's already filtered out. It's the opposite of what you said.
It was a magic water spear. If he had to SPECIFICALLY filter stuff out that would've gone through since he never even knew magic existed.
I'm not equating a magic attack to someone just talking, I'm equating it to a sound based attack because "not having a filter set up ahead of time" for both of them specifically would mean it gets through. And it's blatantly not the case for Accelerator.
Him consciously having to let gravity and sound reach him period means that he can filter stuff out based on what's harmful to him.
A fuck huge sonic scream will do jack to him.