Was our Lightworker Healing Protocol session for [name withheld] effective in rescuing that part of his soul we saw was left in limbo after a past life when he was killed savagely?

This did, in fact, take place as you witnessed. So your Protocol session for him was instrumental in rescuing a past part of his soul that was trapped following this dreadful experience. It illustrates the fact that more than one incarnation can be mounted successively, and the existences dealt with, or not, as the case may be, in the typical fashion. There can be delays and interference and that is what your Protocol is designed to correct, and worked beautifully on his behalf to resolve that dilemma and return that portion of him to the light once again. This will help with his own healing and his own inner calm and stability.