A police investigation into the shooting of a couple at a swingers' party appears to have breached the force's own protocols by failing to immediately separate the two officers involved in the incident.

Video footage obtained by Fairfax Media shows that the policemen responsible for the shooting of Dale Ewins and Zita Sukys remained together for more than 90 minutes after the Critical Incident Response Team stormed Inflation nightclub on July 8.

The two officers drank water, spoke with each other and talked to bar staff for more than an hour after the shooting at 3.54am.

They then spent more than 10 minutes in a bathroom with at least one senior officer, where they removed their helmets and body armour.