Refering out is definitely a good self-check to be able to do. Too many therapists can't figure that one out either for fear fo the client's reaction, or because it feels like a failing in some way...

If you are still uncomfortable about the paper, can you detach a bit from it and write it in the 3rd person, hypothetical sense? Maybe re-do a safety plan with a hypothetical situation, and write about what it must be like for a client to go through that? I know the reaction paper is to help build empathy around the situation, but you clearly already have that. You are also working on it in your own therapy. Unless the class is specifically for DV survivors to work with DV clients, there's nothing dictating the need to use your own personal experience.

Please let me know if I'm off on this, but from your posts I'm getting the impression that you feel you have to be authentic to your experience. While it will help you empathize, it also keeps you locked in your view of how it would feel. Part of the development of empathy as a therapist is being able to open to your client's unique situation. It's certainly ok to draw from your own life, but also important to be able to see how another's experience can differ. Can you use this reaction paper more as a way of blending your reactions with say, how your best friend might react to the same situation? It could help give you distance from it and keep from disclosing more than you feel comfortable...