I don't know... I think that an ISTj would first gather some steam and refrain from blowing up BUT if it is too much... you could get "Se hell".
here is a sample SMS I got from an ISTj woman I know:
"I'm going out of my mind! I have to beat this idiot, I want to scream and curse, I'm sick with anger. The idiot is [her coleagues name] Sweet kisses, I wanted to blow off some steam."
This is a rough translation but as you can see... there is outer composure and inner rage that only the very close get to see.