The sign of admiration is because Luigi noticed that Sonic blocked his attack, then decided to end it once.

Please popularize the use of semi dark sonic, their appearances are very scarce.

Spanish:

El signo de admiración es porque luigi noto que sonic bloqueo su ataque, entonces decidio acabar con el de una vez.

Por favor, popularicen el uso de semi dark sonic, sus apariciones son muy escasas.