For me it’s a toss-up between:

A) Obi-Wan convincing Reva to let him go so they can take on Vader together, explicitly because "he’ll only see me”… only for Obi-Wan to LEAVE and Reva to decide to make her move against Vader anyway ALONE;

and

B) Reva walking off a stab wound from Darth Freaking Vader to go kill a kid she heard is being hidden from Vader on Tatooine to apparently stick it to Vader, even though the holo-message she overheard doesn’t identify Luke as Vader’s son and therefore she should have no reason to want to kill him, and for all she knows killing him could easily be what Vader wants.

Yeesh.