The word "retaliation" seems aggressive but I'm assuming they just mean to pull a small prank on them and then intimidate them into reconsidering their actions in the future? Just doing a show of strength and talk about how much they suck lol.
As for the noble...if all they wanted was to offer a job why would the bodyguard resort to stalking him lmfao. All he had to do was just straight up invite him to the noble's mansion, or like just now, have invited him to talk in the carriage. This seems like an unnecessary ploy to make that noble look like the bad guy, when we could've been done with this side story 1-2 chapters sooner.