US-P18.085ab ।US-P18.085cd ॥
In plain words
But then consciousness would have to cross over into the intellect, the way fire passes into a ball of iron. — No: it is like a face appearing in a mirror, and in the mirror's case that crossing over was already ruled out.
Close to the Sanskrit
But surely, in this way there would be a transference of consciousness, as fire in a ball of iron. — 'Like the appearance of a face': by this, in the case of the mirror, that has been refuted.