Enough time should be allowed for students to think and respond. Some students have to hear and write in English, then translate into their first language, then re-translate to English.
Plagiarism is a totally new concept for many students.
In some cultures using the words of the experts is preferable. University regulations and the reason for these should be clearly explained. Students entering university have a wide range of formal and informal experiences. Structure learning to incorporate the interests and experience of all students. The value placed on assertiveness varies across cultures.