Referenced User Roles based on Content Changes

Hah; figured it out.
Turns out my other test instance has some serious problems in it.
WARNING!!!
Since I had more than one content type which can be affected, I discovered a shared User Reference field CANNOT be reused in RULES.
Make SURE if you have multiple content-types with user references, that each field is separately NAMED.

I was able to set this up (in another, better functioning test instance) by:

In Rules, go to:

1. Add a new rule
2. Under Label: set to whatever you like
3. On event: choose, "After Deleting Content"
4. Under categories, I entered: "account control"
5. Make sure "This rule is active..." is checked.
6. Press save changes
7. In the ON condition, press add condition
8. Select "Content Has Type"
9. Press Next
10. choose whatever content types this applies to for you
11. press next
12. Under DO, press "add an action"
13. Select User -> "Remove User Role"
14. Press next
15. Under "Arguments configuration", select "Referenced User" from "User whos roles should be changed"
16. Choose the roles you would like to disable!

I haven't had a chance to test it in depth yet; but, in my better (and more complete) testing instance of Drupal 6, I have separate rules for separate Distributor and Service "Company" content types.
I will assume (until Monday, when I can test it), that it works.
I'd much rather have ONE content type for "Company" and then be able to compare a taxonomy term applied to the node; but the current version of Rules doesn't allow me to have a taxonomy condition.