You're a codex too late. You don't lay them down anymore. It's just a FNP roll, taken right after a failed Armor Save. And on a personal note, I'd be annoyed if an enemy did that. The game is long enough as it is. When we're just sitting around talking, hanging out, oh hey look at what my Necrons can do for Reanimation, that's cool. Slow down the game with disassembly and it will lose the novelty and just get annoying by Turn 2.