[Interesting question! He debates spelling it since learing how to finger spell is a valuable tool for beginner signers but... that’s not how he signs his name so it would be a lie!!
So he balls his hand into a fist with the thumb sticking out between his middle and ring finger, making a platform with his other hand, palm up, striking the thumb across it like striking a match.]
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So he balls his hand into a fist with the thumb sticking out between his middle and ring finger, making a platform with his other hand, palm up, striking the thumb across it like striking a match.]