Back when a was a tech lead and made hiring decisions for my team I would run the questions I asked candidates by the rest of the team in a 1:1 setting. We were checking that people could answer the questions well -- and sometimes when they couldn't it could show us weak points and give us ideas for training.

I always ended those 1:1 sessions by asking if the team member would be comfortable working with people who couldn't get to the correct answer. And if they could, what they would want to see from a candidate working on the question.