Place it right after the strange moment is shown, then follow it with the Metal Gear Alert for the discovery and the Law and Order Dun Dun for the dramatic pause that follows.
About this sound
This clip is Matt Berry asking “Whoa what was that?” in a startled, rising voice, as if he has just noticed something odd out of view. The delivery is dry and theatrical, turning a simple question into a comic double take. It feels funny and awkward, the kind of surprised reaction that makes a strange moment land harder.