[quote=@AcerRo]
Scarlet is fucking odd dude. She condemns Eli for being like her father but is weeping of a nerdy girl who got a power boost and who's bad attitude turned her into a power hungry bullie. 

Eli is begging to help her and she won't let him. So instead, she's protecting a girl that took a couple hundred if not thousands men, women and children.

Some people I will never understand.
[/quote]

The difference between Scarlett and Eli is that Scarlett has an actual conscience. She feels guilty for the bloodbath that she knows is about to happen - it's pretty damn obvious, after all. What's also true of Scarlett is that she has the adept ability to see the proper side of someone. She saw the dark side of Eli and that's why she chose to run, paired with everything that was going on in her life. She saw that Ruby has a lot of problems but that overall, she's just a young girl who wants nothing more than to be forgotten by the world. Ruby only lashes back because her enemies have followed her and they still wish for her downfall. Like a cornered animal, you could say.

Ruby has barely even killed a hundred people, if anything. And they were all FBI agents, for the most. Also, she's not protecting her, she's telling Elijah what's actually going to happen - Ruby is going to fight and Ruby is going to die. Ruby has no intentions to run away and Scarlett knows that because Scarlett knows Ruby. Also, if you want to put it that way, Elijah protected and sought vengeance for Nightmare who was a mass-murderer.