It's kinda interesting that that ladies' frame fractured at the center. I think that frame is weak if the direction of impact (or any other type of stresses) is misaligned with frame's own orientation. (Prolly, straight pull) Also, I am thinking it is prolly weak to compression at the center where it's probably thinned to save weight and all. (Maybe it's designed to crumple like that to so debris become small quick and impact people at less force.)

I think the demo with the MTB racing carbon fork is a little different. I am pretty sure that fork is designed to take misaligned stresses which you face in trails. So if you do that on that lady's carbon track frame at the down tube center, it will probably snap.

Speaking of B*C frames, you see those tubes don't have circular cross-section. I think it's 4 wedged star-like. I bet impact stresses would focus on the wedges. I thought they were doing that to stiffen the frame. ... Give and take huh? But then I saw a guy tricking on a B*C frame before. ... Anyone know about that?

Darn you won't need to answer that. I won't be able to afford a carbon track frame anyway.