The teacher is completely discomfit by the unexpected question.
老師被那意外的問題完全擾亂(楞住了).
互聯網
To cause to feel chagrin ; mortify or discomfit.
使懊惱,使受屈辱,使窘迫.
互聯網
Flash forth lightning, and scatter them; Send forth Your arrows, and discomfit them.
6求你發出閃電, 使仇敵四散; 射出你的箭, 使他們潰亂.
互聯網
