When someone COMMENTS on a POST in a CASE where do I find this Comment? I am trying to create some kind of workflow or process that updates another field when a post is made and that I have accomplished, but I need it to happen when these COMMENTS are left on posts as well but I cannot find where they are located and how to fire off of them. I have been looking for it via SOQL and cannot find the home of these things, I can find the post as FeedItem easily but I cannot find the Comments under it and how I relate them back to their Parent and the Case itself.

As the attached picture shows I have looked in the FeedItem,  UserFeed, CaseComment, Case objects and cannot find this item in any of them.