Return of the betrayed MATE
One of the omegas who accompanied them also made recordings with his phone of some conversations between Jarl and Lizzie, the moment they shot Katrina, and when she fell off the cliff.
Ragnar had it investigated and they discovered the videos, compiling all of them, also the ones showing Jarl sacrificing young human females and some female wolves from his own pack, just for the thrill of hunting. In the surveillance camera of the cabin where Ragnar was staying, you can see the exact moment he arrives with Katrina's injured body, and later the doctor's arrival to treat her.
"What the hell is that?" Mauricio asks again. "Did you gather us here to show us this?"