i've haven't let loose face to face with him yet (because my childhood taught me rage is uncontrolled so it terrifies me to let go enough to test that). but i HAVE screamed absolutely vile things at him in the journal. when he reads it he doesn't even bat an eyelid and jumps straight in to talk about it. he doesn't take it as a personal attack (even if i try to make it a personal attack). he knows it isn't about him, it is about whatever issue i am dealing with. he has NEVER gotten mad back, upset, hurt, threatened to terminate, withdrawn, sarcastic, nasty, etc. He has ALWAYS remained steady and gently pushed to explore the problem. I have also been afraid of physically attacking him if i ever let go. I don't yet know what he would do about that, but I suspect he still wouldn't terminate/etc. He would simply work on making things safe to talk it out.
Good luck with your t