While I can't comment on this situation, I find is surprising how many pilots are quite happy to fly out of airports in high terrain with both ND's selected to weather instead of terrain......in the winter when there is no CB's for at least a thousand miles. There is a theory that the terrain display will show when there is a GPWS warning but at some locations, you may not be able to outclimb the mountains especially if an engine is lost. Some like to immediately level off after a problem in these areas as well(at least in the sim) while still headed for terrain.
Now in this case, there is almost certainly weather around but if you are at low altitude in the mountains, you may want to have one display on terrain or at least be checking the terrain once in a while on the other, especially if deviating off the safety of the airway MEA to get around weather.
Last edited by JammedStab; 4th Jun 2015 at 23:44.