Forum:Ninja Pro with Riot Shield?

Hello, all. While trying to rank up close-range kills for Ninja Pro on my latest prestige, I decided to try using the Riot Shield. Strangely, using the shield's melee did not seem to count toward my total. Can anyone confirm or deny this? I'm willing to accept that it was just a fluke, but if not it's an interesting error. Thanks in advance for any comments, much obliged.