Expand that feeling to others, and you enter the fourth level. Do not, however, confuse this feeling with empathy. In the holistic realm you merge with another entity for information, understanding, possible change and healing, not to hold the others' pain or joy. The identification with ones pain for making appropriate changes does not require its holding and sustaining. You never become the other, but merge with its spirit.
Actors call it role-playing.
Let's face it, Tom Hanks was Forrest Gump. Yet, I think we all experience the fourth level occasionally. If you have, then it was at that moment you identified with your vehicle. You yourself were not hurt, but you felt for the vehicle you were driving, identified with its experience and expressed its pain. It is not so far fetched.