It's really great that you can recognise that his anger is related to his grief. He's probably lost sleep, is worried about lots of other people, things and money, and needs someone who will ride out the storm and not make life harder for him right now. Hopefully someone will do the same for you one day.

Sheesh! That's no excuse to threaten someone like that. Just offer him your condolences, there isn't really much to do here. Just remember, it's easier to cope through anger than sadness!

People deal with grief in different way cut your boss some slack and send him/her some flowers and let him know he/she can speak with you.( if that is something your comfortable doing.

It sucks but give him a little time.

He sounds depressed. But that doesn't mean he can abuse you

He just wants to be in Mortal Kombat.

Wow !!!! I've had my share of bad bosses in the past, but never one who says they're gonna reach for my spine through my ass. That's a new one! I know I would have a really hard time with that kind of verbal abuse at some point . Hang in there, OP !

That's still an awfully harsh reaction. But grief is a very strange, very difficult thing and can really make you crazy. He might be lacking sleep which can make anyone moody, if he's the one stuck dealing with it stressed over funeral arrangments and all the things you have to do when somebody dies. It's such a difficult time, I can understand why people can be quick to anger. Best to not take it personally and just be patient while he grieves.

Anger and grief are not two separate feelings. Anger is part of grief.

if he does it again, firmly tell him that even though he is grieving, there is no exception to this behavior.