Well, you know, that's what Firestorm does. And he can materialize things much, much stronger than cement. If Juggs can't fight, he can't fight. And in this scenario, no one will ever be coming to help him out of it, so... yeah. And that's not really the only option Firestorm has. Ridiculously versatile, that guy. I mean, hey, before you were fine with Gorgon turning people into stone left and right and that being a "win". And even though many beings of immense power (especially mystical power) wouldn't actually be killed by that, you still thought it was good enough. How would this be different from that?