It was already quite strange and spooky to not be able to hear anything and when the system suddenly switched his hearing back on, it felt like his sensory overload all over again.
Since Mako had spent some time without his sense of hearing, his body had adapted to it and now his ears had become super sensitive making even the little background noises feel so loud and intense.
Mako covered his ears once again and waited for his senses to stabilize back to normal again. It seemed like Mako was still discovering new things about the system and he would have to look further into how it was able to block and restore his sense of hearing at will and whether there was a way to manipulate it.
If Mako could command the system to gradually block and restore his senses, it would be a great skill to have as Mako could in theory counter any type of sensory attack, no matter how strong.