Doesn't seem to have much of a purpose within the Speedrun, but it's something noteworthy.

I thought that I can do this, but after 10 attempts, I stopped trying. Cool KomodoHype

For me, the timing for it goes along these lines:

• Position yourself at a far enough distance away from the Metro Cop
• Shoot your Pistol right before entering the Loading Trigger
• Right after you land the Headshot, pick up the Pistol.