He stopped me, wagged a finger, then hooked his glasses off his nose, letting them dangle on the string around his neck. He looked me square in the eye. "Put it down," he said.

他阻止了我，晃了晃手指，然後把眼鏡從鼻子上鉤下來，讓它們掛在脖子上的繩子上。 他直視我的眼睛。 “放下它，”他說。

to look sb. square in the eye    直視某人的眼睛