If Incident created due to reply to expired incident

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In conjunction with my post here https://cloudcustomerconnect.oracle.com/posts/1c3dfa733a, I am trying to find a way to identify incidents that were responded to that created new incidents (trying to identify the original, not the new)

I am having trouble building a column expression that essentially says "Yes" if another incident was created and "No" if not.

The only way I can think of doing this, since I believe techmail creates the new so rules are not run on the original, is to locate the quoted incidents.ref_no in an incident which is not incident.ref_no. I am not sure how to phrase this.