Change in momentum of your head. As the butter, you’re head doesn’t move much. You put your whole body into it. Your whole body slows down.
As the butted, your head jolts back having received the entire energy of the butter. Without foreknowledge of being headbutt, you didn’t tense your neck muscles.
Also, as the butter, you wouldn’t use a headbutt on a bigger headed guy.
Source: if got a huge melon and have butted heads before. Generally, I’m coming out unscathed.
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