Monster reincarnation

"Imperial Order" only negates the effects of spell cards, not their activation. So if your opponent activates a card like "Monster Reincarnation", they would still have to pay the cost (discarding a card) in this case. "Imperial Order" would then negate the resolution of the card (so they wouldn't return a card from the graveyard). So what your opponent did was perfectly legal in order to get the right type in the graveyard to summon the BLS.
 
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