If a card specifies that more than one action occurs when the card is itself resolved in a chain of effects, all of these actions are to be resolved in the card's chain of effects uninterrupted and in the order listed on the card. No actions may be declared to occur between these multiple actions. The actions listed on the card are considered to have been declared in the reverse order as they are printed. As an exception, in one of the
effects of a card is an attack, cards may be played that cancel the attack, cancel one of the strikes, or that otherwise are playable during the strike sequence.
It does not prove and does not exclude possibility of simultaneous actions. It just forbids of declaring anything between multiple actions of card.
After all such actions exists. e.g. "Discard the Wizard (i.e., he becomes unrevealed) and any non-item cards he controls. Place any items he controls under this card and keep these off to the side (these items are considered to still be in play)." from Sacrifice of Form does not seem to be separate actions.
Resolving it strictly as separate:
1. Discard the Wizard (i.e., he becomes unrevealed) and any non-item cards he controls.
2. Place any items he controls under this card and keep these off to the side (these items are considered to still be in play).
would lead to situation where during resolving 1. items are discarded too, because
When a card leaves active play (discarded, eliminated, returned to owner’s hand, etc.), discard all cards played on it.
(another Balrog clarification)
not giving chance for 2. (items can be placed off to the side, but cannot hang in air without host).