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Event Chess Game (Bad_Dobby_Fischer - rychessmaster1) #4

Only captures of enemy pieces become souls. So no, not the fired piece or any other allied pieces that dies in the shot.

1: only the king can use souls.
2: You have no souls right now, since you haven't captured any enemy pieces after the soul eater event started.

Rooks still has normal capture, yes.
Rooks can fire at a square regardless if a piece is occupying the square and regardless if a piece is standing in the way. The only conditions are that the rook must be holding a piece and it may not result in capturing the allied king.
When you promote to a queen otb you usually take a queen your opponent has captured earlier in the game and put it on the promotional square. In this case, you cannot do that if your opponent is keeping that queen as a soul that his king can use. Note 4 is just kind of stating the obvious that you can't replace your pawn with a piece your opponent is keeping as a soul.
Of course we don't have the hassle of needing to find pieces when promoting online