To be fair, he wouldn't have gotten pneumonia from walking home in a snowstorm. Being at home or other enclosed spaces with someone infected with a respiratory illness - yes. Being in the cold? No. Amazing person, just the same.
@kaffando We didn't intend to imply as such. (Not sure why you read it like that, considering your knowledge.) Being exposed to cold temperatures can lower your immune your system, affecting your ability to fight off infection. So Bentley's long walk through the cold and succumbing to the illness so severely can certainly be connected.