Forum:Royal Oppression vs. My Body as a Shield/Destruction Jammer

I have a quick question regarding Royal Oppression, here are two scenarios.

1. Royal Oppression has been faceup on the field for many turns on my opponent's side of the field, I special summon a monster and they activate royal oppression to negate the summon. Could I activate My Body as a Shield or destruction Jammer to negate royal oppression? Because my opponent ACTIVATES royal oppression's effect and My Body as a Shield says "Activate only by paying 1500 Life Points when your opponent activates a card or effect that would destroy 1 or more monster(s) on the field. Negate the activation of that card and destroy it."

2. Royal Oppression is facedown on my opponent's side of the field and I special summon a monster, they flip up their royal oppression and activates its effect. Could I activate My Body as a shield or destruction jammer to negate royal oppression's effect and destroy it?