Existing Wording
For example, if a Condition resource references a particular Patient as its subject, and it links to a Procedure resource as its cause, there is no automatic rule or implication that the procedure has the same patient for its subject.

Proposed Wording
For example, if a Condition resource references a particular Patient as its subject, and references a Procedure resource as its cause, there is no automatic rule or implication that the procedure has the same patient for its subject.

Comments
The changed wording makes it clearer that the subject of both clauses is "a Condition." As originally worded, some could interpret the sentence to mean that the patient links to a Procedure resource. Also, for consistency, I suggest using the word "reference" twice rather than "references...links to"

Grahame's Comments
ok