[Hijikata observes as Oengus kneels down and... casts some magic, from what it looks like, leaving the shark is peacefully asleep a moment later. Wow.]

...

This does make it easier, yeah. But do you seriously want to take it to the Great Ocean Lake? Won't the polluted river around the city do?

[There's basically no fauna or flora in the latter due to said pollution, but he doesn't need to tell Oengus that! He still expects him to reject the proposal based on the description alone, but the great saltwater lake is so far out, regardless of which transport they take...]