*considers how to phrase this without coming right out and saying that you were a pretty treacherous individual on Arda* *frowning slightly* I have ... evidence to show that Maeglin is not entirely a reformed character. There's reason to believe that he might try to gain a foothold in Gondolin once more but to do so, he would first need to acquire some ... treacherous allies. *gestures with an open palm* Nobles, et cetera.
*rather calmly and blandly as though unaware of any threat whatsoever in his words* It would be important not to withhold any information at this point, obviously, or there'll be talk of complicity at least. *rather earnestly (oh, but he is disappointed in you)* You will be on your guard?