User blog comment:Zolnir/RWBY Episode 8/General Reviews & Speculations/@comment-4365658-20130907052845/@comment-11188061-20130908031403

Oh, so you can't even come up with a proper assumption to explain why she did it? One would assume that it's natural to come up with speculations to explain things, and it's not even a hard deduction at all... Again, no offense, but there has been speculations since months before the pilot episode explaining the motive behind it. I've written some myself.

I've already written in this blog post that I assume that she wanted to prove her own strength. We have no idea how Weiss Schnee was before the golem battle; she may have always been hiding her scar ever since she's gotten it. At that time she sees the scar as a proof of weakness, so she didn't want anyone to see it, much less herself.

After the fight she realized that it was a foolish action. The scar wasn't a proof of weakness, but of strength instead, since she has survived whatever that has given her the wound. So she was no longer ashamed nor afraid to show it, and was now in fact proud to let them see. It fits Weiss Schnee character well in this case.

You should've come to the same conclusion yourself since I've already mentioned in my post about 'proving her own strength'. In short, you're not thinking, and if you are, you're not thinking hard enough.