Equestria just gained an new ally today...or dare I say a new friend. But in the other hand changelings lost a great worker and a soldier, that's hardly uncommon considering that there was a war going on. What truly surprised changelings was what they had understood from such a loss, from...a deserter, a traitor...yes. But an enemy?
A royal commando is send to figure it out with the blessing of the queen and a small squad so they would hopefully understand Thorax intentions and deliver their so called justice.