Hazel saw someone post on L a picture of a grave that said Killian
Killian called Hazel and asked if she knew who posted it
Killian suspected Grape or someone close to Galdor
Killian apparently forgot that they had used a body double, which is why he called LeAnn gloating earlier
Killian and Hazel didn't know if Bo was alive or dead, but based on the lack of PD reaction he was most likely alive and gunning for K
Hazel informed Killian that she will be out of the city for a while, so Killian told her he would make sure to say that "Crazel sends her regards" when they kill Bo again