I feel like Jade has learned the timing of Skulduggery's karaoke sessions at this point...he probably drops by to popcorn the singing and/or commentate on the song selection with him sometimes! Wouldn't usually be in the mood for much singing himself but maybe Skuls has very occasionally managed to strongarm Jade into it here and there by now lmao

Also I actually don't remember if I've had Jade witness Skulduggery flying in a thread yet?? If not we can probably assume he's seen it by this time though, since that seems to be another routine of Skully's! Jade's probably picked up/learned that he's checking out the barrier at the least by now, and likely hangs out by the rail on the main deck sometimes to watch his progress/ask if anything's changed when he gets done with his circuit out there