Snape Makes Ron and Harry Do Malfoy's Work

During Potions class, Draco Malfoy manipulates Professor Snape into making Ron Weasley cut his daisy roots and Harry Potter skin his shrivelfig, exploiting his fake injury. Snape sides with Malfoy, forcing Ron to swap his carefully prepared ingredients with Malfoy's poorly cut ones, leaving Harry and Ron seething in frustration.