Consider: Grace having 'teacher ears'
The eridian students being told he can't hear around corners like they can, because objects stop light, so doing some sneaky mischief like passing notes or making things under the desks where he can't see it.
Only for him to call them out on it anyway.
When asked how he knows, he says he's got teacher ears. He can hear when they're up to shenannigans.
Really though it's just his experience of child/eridian body language and KNOWING how students are when they're scheming that means he can tell its happening :)
This post inspired by a story I heard about a seeing-eye dog that would counter surf for food SILENTLY in her original home, and was apparently VERY surprised when her new owners could see it lmao.













