Process Author Alert When Record Modified by Someone Other Than Assigned User

In Process Author is it possible setup an alert to go out when an record is modified by someone other than the Assigned to User?

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  • The custom field has the following formula:

    ifElse(not(equal(concat(related($assigned_user_link,"first_name"),related($assigned_user_link,"last_name")),concat(related($modified_user_link,"first_name"),related($modified_user_link,"last_name")))),"not assigned user","assigned user")

    I then have a workflow that is triggered when the custom field equals "not assigned user".