What if, weakened and groggy, it hadn't been someone willing to help Serana who'd come across her tomb, but instead a fully fledged Vigilant of Stendarr working for the Dawnguard due to their similar cause? Well, what happens is a sensible, Dawnguardly decision.

The Second Sister is all that remains after Trilla gives in to the Dark Side completely, using that power to slay her Jedi opponents, Cal and Cere, one even her old master. Sometimes, the light just cannot beat the darkness, and sometimes the Dark Lord gets what he wants.

When Goku Black stole Goku's body, he went so far as to also kill what was left of Goku, and also slaughtered his family. But how did Black then escape? Well with a stolen Time Ring of course. There was no way, in Goku's weakened base form, that he could have stood up to any actual enemies at the time. So what if he had met one, unlike in other timelines? - Goku Black Insta-Dies AU

Thor finishes killing Outriders sooner, flies a little faster to the other Avengers, and throws Stormbreaker a little higher. In doing so, he saves mostly everything and everyone in quite a sound fashion. A short and sweet victory after a gruelling day, and the universe will be thankful for it.