Ok, I edited your save file removing the flag for the Lain walkthrough mod and tested it. Was able to play through the Quidditch match without any errors.
Copy that save into your save directory overwriting the existing file. Make sure you have removed and deactivated the walkthrough mod. Load Quick save 1 from your list. When you first load the save you will get a renpy warning that the save was edited on a different machine. Just accept and load it and then you can resave if you want.
Let me know if that solved the issue.