"Okay now...you can't continue to behave this way.....I understand why you feel like this but holding onto the past won't help....so please," Night said as he tried lifting Noctis off his head. The small one barely reacted the whole time, of course, he had one eye open but now that Shade was with them, he completely fell into a deep slumber.
'I guess the shock was too much?'
Noctis was still a kid, all his life he had simply remained with Nyx or in an egg. During his comfortable stay with Nyx, he was trained to fight and survive but shock and grief were mainly human feelings, experiencing something like that was hard and brutal for a child to process. He was a creature of the Chaos, so there was no saying how he actually worked, how long would it actually take for him to mature into an adult or even a teen.