u/Fine-Discipline645

I dont think anyone has ever talked about this and maybe im just overthinking but im rewatching Supernatural and this is s4 e16. The pic is when Sam is driving to Dean bc the angels took him to torture Alastair. This is right after we discover Sam is drinking demon blood to strengthen his powers. The time between the first and second pic is like two seconds and u can see the pupils dilating during this. I was wondering if his pupils dilating could be some side effect from the blood? Idk just something cool i noticed.