extremely emotional because derek wasn’t telling malia and liam to go ahead. he was telling stiles. derek was telling stiles to go because he knew if he didn’t that stiles would have stayed. derek had to use scott as a reason because he knew it was the only way stiles leave him. but stiles looked back. stiles looked back because he was fighting an instinct to stay.
And just the fact that he had to struggle in the first place, that you could see himself wanting to go but also wanting to stay. Wanting to save his best friend but wanting to save Derek as well.
He wouldn’t have stood there for so long, wouldn’t have needed Derek telling him multiple times to go, if he didn’t at least care about Derek, wouldn’t have paused and looked back for a long moment before following the others who were already well inside the church at that point.
Just the knowledge that Stiles had to weigh his options, between Scott and Derek says SO MUCH.
And you don’t even have to take that to mean anything romantic. Take away what us Sterek shippers see as the romance in it and you still have a Stiles who CARES about Derek, and didn’t want to leave him behind to die, and only went when Derek reminded him about Scott, and how he needed to be saved, and that Derek insisted, several times that he go.
When Stiles Stilinski even contemplates, even thinks about it and HESITATES to go and save his best friend, you know that that person must mean SOMETHING to him.
If there’s one thing you can’t deny, it’s that.