Ace Attorney Investigations: Miles Edgeworth Help

Er....
I'm stuck in Turnabout Ablaze in the Allebahstian Embassy, where I have to deduce something in the knives section.
I'm absolutely clueless right now.

Is that the one where you can see a broken Steel Samurai Spear ?
If so the spear is the problem.I kinda forgot that part though.

Yep deduce the spearhead (notice it's bent) and present the autograph you received from Larry.