Should I Reply?

Location: Kentucky

Background: In February of 2023, I was home with my highschool aged daughter. She was playing Overwatch when I thought I heard a dog howling. I looked out the window but saw nothing. Some 20 minutes later I heard it again and muted the TV and waited and heard it again a few minutes later. I then went outside and looked around. Across the street and a drainage ditch an elderly man was on the ground in the rain. I ran over and called 911. Stayed with him until an ambulance arrived. They asked me some questions, that I had no answers to, and took the man away. From what I gathered from the old, maybe late 70s, he had fallen off his porch. He reeked of alcohol. He also seemed drunk but I cannot say for sure. . . His home is close to 120feet away from mine.

Fast forward to yesterday. I received the demand letter from his son. It was on normal printer paper without letterhead. It seems that he thinks because I didn't find his father sooner that I am responsible for the hospital bills and because I called 911 rather than take him myself I should pay for the ambulance. He claims that it took him two years to track me down. He wants almost 47k.

From what I can tell there isn't a legal theory in which I would be responsible for the older man’s hospital stay. All I did was call 911 and put a blanket over him because the rain was cold. I didn't give any information about myself to the ambulance because they didn’t ask. They mostly asked if the man had any health conditions which I didn't know…

So my question is should I even answer? He threatens aa lawsuit but doesn't give a lawyer or law firm name just a vague “I don't want to involve my lawyer in this matter.”

Thank You