route 2
he might have activated route 2, more likely he wanted to go to a particular
waypoint, having entered the name, if there was more than one in the world it would have shown the lat/long of each one, or if it was a navaid, he may have just chosen the wrong one. another possibility is that he wanted to descend to fl270 and put it in the heading window by mistake, all possibly under the influence of hypoxia.
if the aircraft was in vnav path it would keep its altitude until the engines failed, speed would reduce to 10 ten knots above min clean speed and then default to speed priority and commence a descent, all stable.