Sorria and her party left the Dungeon after they finished cutting up the boss for me.
I insisted that they leave first since I can't be seen leaving with my Shadow Guards in tow or else Instructor Henry and any other classmates who happened to be there might start asking questions.
Thus, I gave them the excuse that I needed to sort out all the loot we got first before we headed out.
They looked quite disappointed by that and they asked if they could meet me again some time in the future.
Since they were actually quite competent Dungeoneers, I didn't think it was a bad idea to have some extra connections so I told them that I was a student at Aerialla Academy and they would be able to find me there.
I also told them about Mother's vineyard outside the city just in case they wanted to look for me directly and I wasn't at school.