[ Bolin gets his general directions from Korra, and he's pretty on-board to be lending a hand to a dude that (at the very least) wasn't a huge jerk to him or to her. Honestly, with guys like Bolin, that's often more than enough to work with.

His arrival is also pretty hard to miss if one happens to be in the area, all things considered. Or all sky bison considered, since Appa does have that way of making himself present with a thud and a grunt. Bolin makes a point of giving him a thorough scratch on the head before dismounting with about as much stealth and delicacy as his ride did tbh. ]

Helloooo! Korra said someone ordered a ride? [ Why is it so quiet by this river. ] She didn't mention any potential ambushes, so you know. Now would probably be a great time to mention those if there are any. No pressure, though!