IF, in the extreme unlikely event I hope, the skull was pierced by a pointy or edged object. The person experiencing the trauma would be able to distinguish between skin trauma and skull trauma, am I right? It would feel differently. And also, if the skull was impacted by a pointy or edged object it would likely be stuck in the head if it penetrated it, no? It's just that I read it more easily can be damaged by low velocity objects as opposed to blunt forces which is what it only effectively can protect from.