Originally posted by: Transference
That was his usual initial reaction without much thought being given the gravity of the situation.
Later, his reaction keeps getting intense every passing second, with Gautam mentioning Raavi announcing it to the whole world about her marriage. You have to go back to watch that scene. From playfulness to concern for his brother, then reprimanding and finally seething in rage. It was one of those fantastic scenes where the boundaries blurred between Dev-Shiva. Their conflicts were just a treat to watch.
He starts by telling him about his warning and then blows off when Dev points out that he can't be rude like him.
That ticks him off, and he loses shit!

Look at him!!!

His anger starts here.

He was so right about everything!

In this scene, it's surprising to see Shiva saying: “uske Bachpane aur Nadaaani ko tune khud badhava diya hai.”
This makes me confident that Shiva has always been the most intuitive and intelligent of all the brothers. She is sharp and grew up extremely fast voluntarily for the sake of his family. He is neither calm nor can be fooled like Gaumbi because of goodness! He isn't diplomatic as Dev, nor he is naive as Krish. He is intuitive, crisp and understands people around him.