Put it near the end of a scene, after the turning point has been shown, and follow it with It Was At This Moment He Knew for the realisation, then a Fail Sound Meme to close the sequence. For a second order, place Darth Vader Nooo first as the reaction, then let this line deliver the news.
关于此声音
This is a 14-second French movie line in which the speaker tells someone they have lost Stark. The words are plain and direct, and the loss at their centre gives the clip a heavy, sombre feeling. It works as a short dramatic beat, landing hardest when the listener understands that a valued ally is gone.