Proximate Cause and Efficient Intervening Cause | Criminal Law Discussion

[@thamarakumari-d5d]

"A grocery store negligently leaves a wet floor unmarked. A customer slips and falls, breaking their arm. They are rushed to the hospital in an ambulance. On the way, the ambulance is involved in a car accident due to unrelated circumstances. The customer sustains further injuries in the ambulance accident." In this scenario, what is the proximate cause? And is there a remote cause?