So we all know P03 does remember his time as a stoat right?
So what if he gets really nervous or anxious about thunderstorms because the flashing light from the lighting reminds him of the flash of Leshy's camera? He kinda just jumps or flinches whenever lightning flashes.

But that's where you come in!

You notice that he gets more aggravated when a thunderstorm is approaching, as if he's dreading the worst. So when the storm hits, you ask him about it. He's pretty stubborn when he's anxious so he's going to deny anything is wrong at first. But with enough patience P03 will admit that he's afraid of the lightning because of the flashing light. So you comfort him, saying that you're going to always be there when he needs you and that you won't anything like that happen again. P03 wanted to protest saying that you don't know that, but he was getting too tired to say anything back. He just nodded and laid his head on your chest. P03 fell asleep rather quickly, with the storm being long forgotten. You adjusted yourself so that you were laying down with a sleeping P03 on your chest. You fell asleep shortly after knowing your favorite Scrybe was safe and happy.