What on EARTH? Why would a driver go backwards on the track? It is possable to turn around (slowly) on a tight stright away.. The race was under the yellow flag anyways. Nothing would have been lost hardly by taking the time to do that.
Looks like Morbidelli was actually given a cue'd signal to rotate the car, but I don't think the official had it in mind that he'd drive 100meters down teh track the wrong way before spinning it.