Fiduciary duties appear in a wide variety of common business relationships, including:

Trustee and beneficiary (the most common type)
Corporate board members and shareholders
Executors and legatees
Guardians and wards
Promoters and stock subscribers
Lawyers and clients
Investment corporations and investors
Insurance companies/agents and policyholders

Now based on the above, I don't see Amarex having a fiduciary duty to CYDY, but I DO see CYDY having a fiduciary duty to SHAREHOLDERS to not let $80mm go unchecked...