Pretty early in his career (episode 5, to be exact), Seiya punches Shiryuu so hard that Shiryuus heartbeat stops. And then, despite being terminally wounded, punches him again to restart Shiryuu's heart.
Seiya (almost collapsed due to blood loss, pretty much about to miss): No... I never wanted the fight to be like this... I'm not letting him die... not... die... DRAGON! YOU WIL NOT DIEEEEEEEE!!!