Ive never had problems with capita boards being durable, but I have to say. There's no way you didn't "feel" that happen. I mean, that's not the type of wound that you notice while checking your board out before putting it on your car rack.
That's the type that sends you sailing when it happens. It would be pretty cool if capita covered this under warranty but def looks like user error.
Either way, I feel for you, that really sucks. Especially if it's a new board.