There are soooooo many things wrong with how this one is written.
It’s supposed to be a snippet of conversation, yeah? Well, conversation means dialogue, and dialogue means you use quotation marks because someone is speaking.
Do not use em-dashes to start lines of dialogue this way.
The end of a sentence needs end punctuation.
Also, ’bout is short for about, so it needs an apostrophe in front to show that a letter has been left off.
Questions require question marks even when they’re rhetorical questions.
“I’ll kill you.”
“Heh. Well. How ’bout… no?”