Ive heard that too Jeff; the story (I will make it clear this is still unconfirmed rumor) said they were looking for good areas to do icing certification testing for a helicopter, so they were obviously scouting around, in ice. The (unsubstantiated) story said that they experienced inlet icing and probably put the eng anti-ice on while they were coated. Enough of that can stop both engines. The system I am familiar with is not meant as a de-ice; its preventive only,. Suddenly heating 50lbs of ice at the engine inlet on both sides all at once will make a lot of the 'bad noise', then you go down.
But we await the final truth to arrive; this is only an exercise of the mind for me.