"If we want to convince Ravana that we've already left, it doesn't make sense to destroy any of his equipment just now, unless we do it in a way consistent with our cover story. Thrash, you could smash them in your role as gardener, or allow them to be overgrown by plants. I think we should keep at least some of them around for now. As long as we know how Ravana is watching, we have a chance of tricking his vision."
I strengthen Yerkan's illusion, fooling the sensors into observing obscure things like temperature and radioactivity which Yerkan may have missed.