You shouldn't tell your classmate to shut up.
Mary and Edward are giving a presentation to their class together, but Mary doesn't understand the topic well.
Edward wants to present accurate information.
Edward waits for Mary to finish speaking, then adds the corrections to her information as bullet points on the board beside the presentation.
Edward interjects while Mary is speaking and tells her to shut up, then supplying the audience with the correct information.
Mary thanks Edward for the corrections and the two score well on their presentation.
Edward is docked points from his score for poor behavior and Mary doesn't want to work with him again in the future, feeling insulted.