It was a little more like asking why hair grew out of his face, so Tony frowned thoughtfully, clearly unsatisfied with this answer, and only a little distracted by the suggestion that Felwinter maybe only had one Exo friend, too. To Felspring, he answered, "I guess it doesn't matter, but it's not there for no reason, and I don't want to find out that the reason is to blow up at a certain altitude right before we hit that height. I have a beard because I'm a mammal and it's supposed to--help me do mammal things, I just happen to style it this way because I look incredibly good and it makes you outrageously attracted to me. Don't worry, that's normal. You guys, you're a step further, someone consciously put that there on him, and not for you, and I have to assume there's a reason for that." Which probably had something to do with what they were for in the first place, so Tony narrowed his eyes and guessed, "He's the devastating headbutt model. You...do something else."