I divide my design classes into teams of 2 or 3, one person is the designer, the others are the challengers.
Designers should feel free to ask questions. But don’t expect any answers.
Challengers can make up answers to questions or provide extra details, if they choose. It’s also fine to shrug your shoulders and say, “I don’t know.”
Remember, the goal is that designers demonstrate how they think through a problem, not whether they find the right answer. There are no right answers.