No, I can't think like this, it is indeed difficult to search for and pursue the Filthy within an environment full of Filth. By comparison, the presence of orthodox mythology in the Filthy Sea is as conspicuous as a torch, no wonder it's hard to shake off the pursuit.
What he actually cared more about was that Citina, she... doesn't! keep! house!
What did she just do? She forcefully slew several Seven Stars level Mysterious Evil, but didn't collect even one piece of material! She just let them fall into the dark depths.
Not to mention, if she had stayed, the few mythicals saved would have had to show some gratitude.
Citina didn't consider these things, but as a guide who pulled them through shit and urine to get stronger, Fang You couldn't help but think about it!
Fang You sighed,
"You shouldn't have pursued, had you stayed, you might have learned more from those mythicals, like whether other teams needed support, or the location of the source of the calamity, and so on."