I'm sorry in case I am misunderstanding. The locus is at the dock. Blaze and the others came from the locus and were passed by Kara who is now at the locus. I think you can assume Blaze can get back there in a negligible amount of time.
EDIT: @ERULASTO: not that it really matters, but Kara's Harmony is actually 8 right now! The roll's math should have been 10- Harmony (8) + Locus (2) + Modifier for crossing into the shadow during the day (-2)=2d10. Kara's first dice was an 8 so she still crosses over.