"Thanos approached slowly, like he was having fun at the torture. Thor himself looked strong, hopeful, even obstinated. Like he would have the chance to win.
Poor brother.
Loki was going to run. Exactly how he has done all his life: would give Thanos what he wanted - the fucking stone - and send himself to the other corner of the universe. He would save his life and, who knows, even survive the genocide.
He would have left every single person in that ship. Even the valkyrie, who has earned his sympathy. Loki couldn't care less for anyone in the whole world, except for him.
Thor. His big brother. The model, the enemy, the best friend he ever had.
He couldn't let him die. His last relative, the last trace of the love he hurried for during all his existence. Since his mother has gone - and even Odin, in his surprisingly caring goodbye, calling Loki a son again - he would never have anyone liking him.
He sighed, frustrated, but stayed. He knew Thor wouldn't run. So he traced a plan, saved his life and left, with everyone thinking he was truly dead this time.
But the ghost of Thanos would follow him trough all this days - and nights, specially. He ran trough all realms, but ended up in front of the insane Titan over again.
Like a undeniable battle. One he would have to face anyway.
He saw him coming. Once, twice... In all scenes, Loki would lost. Which chance would he have against the most powerful being in multiverse? With all the infinity stones - because he would certainly reunite all of them, it was a matter of time.
In the end, everyone became... dust."