June of 1389.
A group of soldiers ride following their leader who rides in front in full armor. They hurry with great speed towards a stone castle.
Next scene: Near the entrance, as a servant comes to take his horse into the stables, the armored figure jumps off his him and we see that he barely reaches the horse's chest. Strutting down the stone corridor, he pushes a door away. As they violently swing we see a room with Serbia, Bosnia and Herzegovina standing over a table. A little surprised at first, Serbia greets her brother with open arms. Hercegovina and Bosnia nod and look at each other. Bosnia now looks like a young teen while the other three seem to be twenty.
"Told you I would come when you needed me" he says proud.
Serbia smiles and hastily looks through the window. Her expression becomes serious as she silently counts Zeta's forces. "Is this it? Where's your boss Balšić (Балшић)? Shouldn't he be here too?" she asks unimpressed.
Zeta (or Duklja, depending on the sources. I guess changing his name took longer than expected) pats the back of his head as a large sweat-drop falls from his forehead. "He's not coming" he finally utters.
"Why not?" she asks.
"He's busy" Zeta replies.
"Too busy pillaging nearby regions, I suppose" Bosnia mutters under his breath.
Serbia shakes her head. "Well, I'd hate to say 'I told you so', but..."
"Spare me the talk. It's not like you never made mistakes...Like battle of Maritza 1371, for example?" he blurts staring at her. The two in the back cannot stop themselves from chuckling.
Her face turns pale. "Um" she starts to stutter: "That's all my former *bosses' fault. Who ever heard of celebrating a victory a night before it happens?!"
*{Vuk Mrnjavčević (Вук Мрњавчевић), the previously mentioned adviser of the former emperor and his brother Uglješa (Угљеша)}
The three try to suppress their laugh. "Stop that. This wouldn't have happened if my emperor Uroš didn't die so suddenly and mysteriously without leaving an heir. It's like all the good bosses have vanished from the face of the Earth" she becomes defensive.
"I don't know about that. I'm pretty satisfied with mine" Bosnia brags.
As he talks, Serbia remembers the battle and takes a moment to sigh.
Flashback: On the aforementioned Maritza river. It's the middle of the night. The army camp is burning and we can see some knights defending the foreign enemy blows while still holding their wine cups.
"No, no, no. This is not happening. This can't be happening? The Ottoman troops are in Asia Minor" Serbia who is standing dumbfounded utters. She looks around and starts shouting. "Hey! Their representative is not here. That means these aren't their main forces. This is just..." and before she can finish, a loud scream catches her attention. She looks in the direction of the east and sees someone with great speed running towards her.
"Bet you didn't expect me, did you? I ran all day to get here" he yells coming closer and closer. He is wearing a white mask and looks like he just turned 18. At the edge of the camp, he jumps up with his saber and hurls at the shocked Serbia who places her sword in a defensive position.
End of flashback: Back in the room, she bows her head grim. "Simply goes to show that you can never be too confident in a victory" she says sad.
Hercegovia approaches and gives her a comforting hug. "There, there. No use in reliving such tragedies. Let's make a plan of battle." Serbia looks at her friend, smiles and nods.
The four of them look at the map again. The war drums are heard, becoming louder and louder. We see many figurines of soldiers and cavalry as well as a gold Orthodox cross being placed on the map. The frame slowly zooms in on the part of the map named Kosovo. The war drums intensify and abruptly end as the frame fades to black.