Meanwhile I got a gag and the dude that threatened me is doing just fine.
Such behaviour is not welcome, neither the initial joke or the actions that followed from the other player. Actions are taken in accordance to our code of conduct: https://eu.battle.net/support/en/article/42673
While we cannot reveal what actions were (or were not) taken, any reports would have been looked into thoroughly. If the player continues his behaviour, make sure to report again to have it looked into further.
If you wish to appeal the action taken against your account, check here - https://eu.battle.net/support/en/article/44277