That is terrifying. I fell at home a couple of years ago and hit my face; managed not to break my nose or other bones per an X-ray I got weeks later, and I stupidly did not go to the ER or anything because it was the middle of the night. I just went to sleep. Obviously I lived and did get things checked out, but I truly think I had a concussion and didn't realize it. If that happened again, I would 100% go to the ER, even with COVID swirling.
Bob was pretty tall; I have to wonder if he did something so, so common for tall people: bump his head on a high cabinet or even a doorway threshold. My tall husband is constantly doing stuff like that.
ETA: Yes, the internet confirms he was 6'4". My husband is 6'5". I'm going to extra warn him from now on to be SUPER careful!