Forum:Tyrant's Temper vs Royal Opression

Hey I have a question and will try to leave it here, I have read and researched that Royal Oppression cannot protect my own monsters due to the fact that once the 800 life points are paid, the monster never hit the field to begin with. If this is true then why is it listed under Tips that this is possible if both are previously already activated and face-up on the field? Can someone please explain? Thanks