Add new contact (other than logged in user) using Caldera Forms linked to CiviCRM under Wordpress
After some tinkering, I think I understand better how this works. I included fields for both a volunteer and a new detained person. Before, there were only fields for collecting information on the new detained person.

Now that there are fields for both individuals: 1) the logged in person filling out the form and 2) the new detained individual.

Next I created two processors: CiviCRM Contact 1 and CiviCRM Contact 2.

Contact 1 I associated with the fields for the volunteer and used name &amp; email as the dedupe rule.

Contact 2 I associated with the detained person CiviCRM contact type and associated with the fields for a new detained person.

By using the processors to define the two contact roles it seems to have worked such that the volunteer's account was unchanged and a new detained person record was created. This post helped me understand it better. I'd read it before but after going over it several times figured out what was needed. I hope this helps someone else.