The Ennead vs Into the Stratosphere

I'm going to be using Spiff's Rules and Clarifications to get all my information on these cards since I don't have them handy. I played a 2 player game last night with Tempest and Ra vs The Ennead. The game itself was flowing perfectly in favor of us and we were having a blast just decimating the Ennead. As the game was coming to the close I, as Tempest, drew Into the Stratosphere which reads: "Select 1 Non-Indestructible Villain card in play, other than a character card, and put it on top of the villain deck." The damage doesn't matter. 

We had two of the Ennead left in play, one at 2 hp and the other full. We declared that the members of the Ennead are technically "Villain Cards." So I knocked out, I believe it was Geb at 2 hp, and then punched Set straight into the sky. Since there we no villains in play, we won.

So, was my interpretation of Into the Stratosphere correct and hilarious or can one of you correct me and crush my funny victory?

(Got a heavy finger pressing that R, fixed the typo :) )