it's called 'hazing' I suppose.
Basica point: a 'bullshitter' will give you grief to size you up and see how you respond.
the will try after they anger you to 'be your fren'
a shill jsut goes for the jugular vein and wants to inflict emotional hurt.
in order to 'hurt' you they need to know your 'triggers' and you 'hot button issues'.
so they size you up through various methods.
and then they try to do something that hurts you.
a bullshitter thinks that they are helping you by wising you up to the ways of the shills.
and then there are trollers, who aren't really trolls.
Trolls are to scare off the unwise who would be idiots here and cause havoc.
Trollers are fishing for people who are loose cannons ready to accuse anyone of anything for political effect.
some times those who troll are also called trolls, but I think that there are different meanings for that.
Basica point: metal, once annealed, is stronger and harder, and less likely to bend or break when using it.
so the 'shower of coals' is to do that metaphorically.