Everyone watched as the merchant caravan continued on its way to the city of Lelvern on its own, without Lucius and his party joining them. After he had told everyone that the injuries done to the Quillow Beast will be slow to heal, they figured that this was a good time to track it down and finish the job. After all, their job was to hunt one down and turn it into a merchant who dropped the request off at the guild.
Many of the injuries inflicted on it were on the front legs which would slow it down majorly. Because of the type of monsters they were, the injured ones were often kicked out of their pod if they were deemed a potential risk or threat to the others. All of these factors combined set up a rather golden opportunity for them to actually take one down now, instead of having to either locate a solo one or separate one from another pod later.