For example, I attacked with a Lvl 3 The ArmoredSacred Walhalance with an effect that says "move all spirits your opponent controls with 4000BP or less to their owner's hand", the opponent then activates the flash effect of his magic card that raised the BP of his spirit to 5000BP.
Which comes first, the effect of The ArmoredSacred Walhalance that moves spirit or the flash effect of the magic card that raised BP?( which can prevent the spirit to return to the owner's hand)
I just want to know.