The inquest, which started on July 29, was previously shown CCTV footage of Mr Briant collapsing in the Cawston Park dining area and staff performing CPR while waiting for the emergency services to arrive.
It heard that Mr Briant was “pale”, “struggling” and “rolling around the dining room” before that.
At around 7.25pm on October 29, the inquest heard the 33-year-old told staff: “I cannot breath. I’m dying.”
In response to the CCTV, Ms Blake said: “The staff are standing there. Nobody appears to be doing anything. There seems to be a long period of time before any definitive action was taken to assist him. They [Cawston Park staff] appeared to be milling around.”
The inquest heard that a staff nurse got oxygen for Mr Briant but it took “several minutes” for defibrillator to be used in the so-called code blue emergency situation.
During live questioning, family barrister Hannah Noyce revealed two members of Cawston Park staff who helped Mr Briant on October 29 were not up-to-date with their first aid training.
The inquest, listed for four days, continues at Norfolk Coroner’s Court.