Reconstructing the crime scene can essentially be understood as me envisioning the crime.
In simple terms, I consider where I would enter the scene, whether through the main door, the roof, a window, or the floor—or perhaps as a medieval assassin, by moving up through the dry toilet.
Not just the means of entry, but the actions taken within the scene, and the manner and location of the exit, can all be hypothesized.
If there is ample blood for Bloodstain Analysis, Jiang could reconstruct the scene very nicely, because the blood could simultaneously show the positions, velocities, and accelerations of both the perpetrator and the victim.
Frankly, the skill of Bloodstain Analysis is sometimes more useful than fitting a few trackers on the murderer or even more specific and real than what cameras capture.
Of course, that's in the best-case scenario.
