I am staring at my Ionos right now, and the only thing I can see that is similar to what you are describing is the plastic piece that goes along the front third of the helmet on the bottom...

If you hit hard enough to make that go like a knife into your head, you are pretty much done anyways...

Wouldn't the foam that the helmet is made of have to completely disintegrate for that to happen? Common sense would dictate that that is highly unlikely...