Forum:Brionac Question

Brionac's effect states that i discard a hand card to return a card from the field to the owner ive also read that the effect targets cards on the field does it mean; for example, i got 5 cards on my hand and also on the field with brionac and my enemy also has 5 cards on the field so if i use brionac's effect to discard all 5 cards in my hand to return all 5 cards my opponent has on the field to his/her hand OR should i return first my 5 cards on the field first before i can return my opponent's cards to his/her hand? need reply thanks alot