Forum:Ritual Buster and Divine Grace - Norsewemko Questions

Couple questions regarding Ritual Buster and Divine Grace - Norsewemko If I successfully summon Divine Grace and activates its effect with priority targeting another face-up card on the field, can my opponent still chain Bottomless Trap Hole or Torrential Tribute to its effect and destroy Divine Grace?

Using the same scenario, can I chain Ritual Buster to Bottomless Trap Hole or Torrential Tribute and negate Bottomless Trap Hole or Torrential Tribute?

Can the second effect of Ritual of Grace be chained to Icarus Attack?