Forum:Caius, Torrential Tribute

this is a question regarding something I ran into today

The Setup
Player A - Me, Treeborn Frog on the field, no set Player B - opponent, 1 face up attack Goblin Zombie

My turn, I had special summoned treeborn from the grave, Caius the Shadow Monarch in my hand, tribute treeborn for Caius, I paused giving my opponent time to react to the summon, I then selected his Goblin Zombie for Caius' effect, at which time he activated Torrential Tribute

The Question
in this situation, is Goblin Zombie removed from play?