I often come across ってなる in informal contexts, but I don't exactly know how to understand it. I think it is like となる in casual speech but it doesn't really make sense in some sentences. For example :
殺すぞ!ってなる
I feel like it's pretty much the same as saying for example :
殺すぞと言う場面になる
But in an informal way, but I would like it if someone can confirm