I recently lost my mother, to a disease that normally isn't fatal. I thought it a delusion, I cried, cried some more, went to work because I knew I would just sit in my computer chair and just wither away, was a zombie, and at one point slammed my fist repeatedly into a metal door to hurt myself and when my husband pulled me away I screamed I wanted to cut myself.
But never once did I threaten an attack at anyone, not even asshole guests.
People grieve differently, but grief is not an excuse for verbal assault/threatening harm. We hurt, but we still have a sense of right and wrong.