You come with skin. You build your own armor.

[ He moves his tapping hand to tap the tip of By's nose instead, before the tapping ceases entirely. ]

And you put it on every morning. Maybe it is such a habit you do not think about it anymore, it's not a choice—but you put it on. You can take it off, if you trust people. Even if you don't, there are places people can get past it. And every time a blow glances off, you know that it could have hurt.