Betrayal

His fellow Knights spread about Canterlot as this New Luna Republic or the NLR strikes at the heart of Equestria's capital. ponies ran from the fighting as the royal guard Stood to protect their home. but this was too much for the home guard to handle the Knight were too few to stand against the mass of pony under the NLR banner. Sketch commanded and help hold the eastern side only to hear the western and the southern side had fallen. Then command fell apart as further orders fell silent and chaos rolled through the troops. Sketch was forced to thin his ranks to reenforce the fallen sides, and start a retreated to the castle gates. But inside the gates Sketch found more than the NLR fighting him as Arrows and Magic slung at Luna friendly ponies that thought the castle would protect them in the time of chaos. Sketches shields blocked both arrows and magic as He put himself between them. "What are you doing my brothers!?!"

He would call out as the NLR forces surged closer Sketch Stood On the edge between them. Conflicted with his duties for both Celestia and Luna as a knight, but his charge was to protect without question to those that couldn't themselves. But would he have to fight with his fellow brother's in arms the royal guards, or even his fellow knights? As the royal unicorn guard lower their heads charging their magic. Sketch drew his sword, as his shields blocked incoming attack from around him to the two ponies frighten and hiding behinds him. "Please my brothers Don't do this these are our ponies we protect! I beg you do not force me..." He ground his teeth as he growled as the NLR had reached the street of the main gate his sword drawn.

A scene that poped in my head when listening to some NLR fan music online and the Thought of Sketch being force to draw his sword against the Royal Guard that served with Celestia. So here it is, and going to leave it at a cliff hanger cause while I couldn't think of any further story for it really sorry T^T