“‘Come in and let me make you a cup of tea.’ At his astonished look, she explained, ‘My mother taught me, when I was a little girl, that when anything very dreadful happens, I must think of what I would be doing if it had not happened, and then do that.’” (ODAT, 3 May)
Not reacting usually means just carrying on as normal.
Not being affected usually means just carrying on as normal.
Almost everything works itself out without my reaction or interference.