“What does a person feel during cardiac arrest?”

I don't know. There are many reports from many people who have survived cardiac arrests and they have had different experiences. Sudden death due to cardiac arrest is not a "one shoe fits all" event. The first thing that happens is people become unconscious. They only report what they experienced after they regain consciousness. Whether those reports are accurate or just something they imagined after waking up is impossible to say. I would advise against questioning this "experience." It will not endear you to someone who is a survivor of cardiac arrest.

Becoming unconscious from cardiac arrest is much different from becoming unconscious from anesthesia or trauma. Cardiac arrest causes oxygen deprivation to the brain. It may affect different parts of the brain at different times, what is called spatial and temporal distribution of oxygen deprivation. That is probably what causes people to have different experiences along with the fact that no one's life experiences and memories are exactly the same as another person's.