Thanks for answering, I know what you mean. But the rulebook says on page 18 "If both players want to reveal an enchantment at the same time, the player with the initiative goes first. He may reveal as many enchantments as he wants, one at a time, resolving each one before revealing the next"
It says "resolve" when the player reveals a hidden enchantment.

Also on the next page it`s said "Each enchantment is resolved as soon as it is revealed"
So for me step 3 of casting the enchantment (resolving) is done at the moment of revealing it.
And here the problem of magebane occurs.
But maybe I don`t understand it correctly.