Hint
The Lieutenant did not have to be a mind-reader to see the resignation in Chief Beifong as Amon walked behind her. While he was relieved to have such a volatile enemy captured, he could still appreciate the poignancy of the moment. The woman in front of him, misguided though she might be, was prepared to give up something she obviously held dear to support her cause. It was a sacrifice that the Equalists could only parallel by sacrificing their lives for Amon's cause.
He folded his arms and watched the equalizing and grew wary. There was something about this woman that was different. Amon had talked about her often enough. She was the Chief of Police. He had reason to discuss Beifong. However, the Lieutenant could see no reason for what happened next. He could brush off the "deal" Amon offered her; their leader would have surely taken her bending anyway, even if she'd kissed his hand and pledged him her undying loyalty. The woman tilted her head back, closed her eyes, and Amon brushed the hair off of her neck before placing a gentle hand at her throat. The Lieutenant did not like the half-second pause before Amon raised his thumb to her forehead, when usually he went about it almost gleefully, jumping at his victims and prolonging their agony as he took away their bending.
The equalizing was over in a heartbeat and the Lieutenant felt something within him lurch with suspicion. When Beifong fell to the ground and did not move again the Lieutenant's suspicion quietly burned out.
He felt it rekindle when Amon carried Lin to the holding bay himself.
