Autor's Note
English is not my mother tongue, so I appreciate your support for any corrections.
He had been ecstatic about spending some time with her, even going as far as to buy her a gift, sort of, it was a recurrent joke among them, but they dance and chat about the contents of their letters and everything else except their feelings, in general they were having a very pleasant night, so when the news broke and she quickly steps up to look for Harry and Ron, he didn't lost her, he keep following her with his seeker eyes, he look for her in the crow and for a second their gazes met and he tried to convey all his emotions in that one look, but a second later she was gone...
He came back to his hotel, retrieve his broomstick and luggage in order to flow back immediately to Bulgarian territory so he could disapparate, once he reach Bulgarian Territory he disapparate to apparate a second later in his apartment near downtown Sofia, he was in distress, as former student of The Durmstrang Institute for Magical Learning, he know about the Death Eaters in their walls so, he contact his teammates and his coach in order to resign, he was going back to school, he was going to prepare the defense against Death Eaters, from outside and inside of the walls...
There has been barely a month since the wedding and the fall of the English Ministry of Magic...
And he is up to his elbows in books, looking for any of the magical protections of Durmstrang, he read in his year-long stay in Hogwarts about spells created specifically for the protection of the grounds, in truth, he never intended to read that particular book, (it was well 10 inches gross) but he noted that it was her favorite book, so he put himself through that in order to work up the courage to speak with her, now, he was glad of his little stunt, he read in Hogwarts: A History, that they were several spells created specifically for the protection of the castle grounds, pass on from Headmasters/Headmistress and Deputy Headmasters/Deputy Headmistress, if true and noticing that the majority of the Schools in Europe follow the example of Hogwarts regarding magical barriers, he had reason to hope for Durmstrang to follow this advice, unfortunately, in the case of Durmstrang, during the Grindelwald era, the majority of the books about the history of the castle and his foundation were confiscated or destroy, bloody Gellert Grindelwald, he can't think about him without a furious rage going through him, he remember how is mother used to cry on the memory of his grandfather, one of the many, kill by the hand of Grindelwald, the very same kid that was a gifted wizard with a taste for Dark Arts, perfect for Durmstrang, but to him and the majority of the alumni, Grindelwald was Durmstrang greatest shame, almost as bad as He-Who-Must-Not-Be-Named, and he loathes the bloody symbol he carved in the wall of the great hall, so much that he used to fight with any student he saw bowing at it, hell, he almost challenge Xenophilius Lovegood to a duel when he see him on Fleur's wedding, but thanks to Hermione presence, he let it slide, but he never be able to forgiving Grindelwald, he'll never do it...
So now he has taken the task of protect Durmstrang, even when there were far more experience wizards, several of them were tarnish by Karkaroff presence and probably he was the reason the spells were lost in the first place, since the previous Headmaster might not trust him enough to passing them to him, after all he was a confess and convicted Death Eater, and even Durmstrang had standards, regarding Dark Wizards (example the expulsion of Grindelwald) so he had to read, but the closest he get to the spells was finding some enchantments in something similar to runes, and then hit him, she told him in one of her letters about her ancient runes classes and it was the perfect opportunity to talk to her one more time, even when there was not the time for having those thoughts, but maybe it was what he need it, remember why he was fighting so hard, even if he never have her as lover, he will have her as friend after all, all he ever want it is for her to be happy and free...
Now, he can't show her the book, but he could ask her for the pointers in order to translate, so he send her an owl with a Two-way mirror and ask her to use it immediately, since he needed her help, but the owl came back with a message of the Headmaster Snape informing him that miss Granger wasn't in the school, he also attach to the owl a book of runes and a vial with a memory, ask him as a favor to keep it safe, telling him that after the war he will ask for it.
He had no troubles in doing this for him, but he was wondering why the Headmaster was receiving the owls of students, at the same time he was scared and preoccupied for her well-being, he assumed she was with Harry and Ron, but he was still sad, so he did the only thing he feel right, he prepared for the war at hand and after, he will look for her, after the war he will have his chance but more than that, he wants to earn it...
The Battle of Durmstrang begins before is ready, not the spells, he sorted out that part, and set it in motion, but in reality, he was never ready for the battle, he was scared, as former student he knows the teacher's lessons but more important, he knows the kind of learning you can get in the corridors and of course, as their reputation suggest, they are all accomplish Dark Wizards, so the battle is bloody, all of them are using curses and combat under the most nefarious conditions, they forget all the rules of dueling and before he know it they are all retreating to the castle having losing the grounds and a few students, only killing 7 Death Eaters of the 20 send to secure the castle by He-Who-Must-Not-Be-Named under the impression that the castle was occupied by Dark Wizards mostly and committed with the purity of blood, when in reality, they were as many half-blood and muggle descendants as any other school in Europe, and under his lead, they defend the school from within, he count 15 deaths inside the school alone, people already mark Death Eaters...
He was preparing to face the ones crossing the gates of the great hall when the windows broke and 20 or more former alumni came in, they arrive to protect their school, the battle got even bloodier, the other mark students join the remaining 13 Death Eaters and they were winning, he saw his friends fall and a uncontrollable rage and despair consume him, he unleash and ancient spell, one he found in the library, dated all the way back to the founding of Durmstrang, he kill with that one spell, all the wizards in front of him and in the backslash, destroy Grindelwald symbol carved in the wall, erasing him from the memory in Durmstrang forever...
After that spell, everything went dark, he fall in the great hall, his energy completely depleted, at the mercy of the remaining enemies, only Sergei saw him fall, carry him to safety, there were a few Dark Wizards still loose, but the battle was won, the group send by He-Who-Must-Not-Be-Named all death, the ones inside the school, teachers and students also death, and he was moved to the infirmary, where he awaited his own death, he had known all along that the spell he used may cost him his life, but at least he had felt true love and shared a freely given kiss...
He was dying with honor, he saved his school, and maybe this victory put them a step closer to defeat He-Who-Must-Not-Be-Named, so he falls sleep, dreaming with beautiful brown eyes, looking right into his soul...
He woke up three weeks later, Sergei never leave his side and contact every healer in the country and even some from Romania to help him get better, he had been crying repeating over and over again about how many times he were under the shadow of death, only returning by pure sheer of will, the head healer told him to take it easy for a couple of weeks after all, he had cheat death several times, in the meantime Sergei start telling him about the aftermath of the Battle and how after he faint, the students in Durmstrang rallied around him and in one angry swift, defeated the remaining of the enemy forces, both openly cry for the death of their beloved flying instructor, who mentor him to be the great Quidditch player he was, and Sergei to be a teacher himself but they were also in tears because the man that teach them how to fly, how to play the game, was a Death Eater...
They held funerals for the death, cast aside the Death Eaters whose bodies were collected by the Bulgarian Ministry and returned to their families...
There was only one thought in his mind when he leaves Durmstrang and moves back to his apartment in Sofia, while he rests under the watchful eye of his sister and Sergei, the only thing in his mind was the fate of England, Hogwarts and her...
He'll wait until feeling better to travel and to look for her...