http://imagizer.imageshack.us/v2/800...673/XircbY.jpg
Definitely made me stop and think for a second.
The hit on top isn't particularly unique, that kind of thing is seen in regular paintball hits all the time. The streak is really interesting, though. It makes me think the fins and the additional material where they meet the capsule portion is providing additional lateral strength to the round, meaning glancing shots are less likely to break or even deform, and the nature of the round makes it less likely to tumble on impact. That seems like it would explain the sliding pattern.