reverse communion slave orders

[militarist]

I'm doing my first communion..reverse communion this time.And it's in MP. I've read,of course all guides. unfortunately I found nowere examples with orders.

Do I undertsand properly, that if one of masters have orders

communion master,PoS,flee

then slave should have

communion slave, hold, cast spell?

And one more question. If slave is higher in the list then master, can he cast spell? and if can - is he still counted as a slave for the purpose of buffs casted by master and takes his share of fatigue?