As a rule on Dragon Spirit/Saber you're powerful enough with a single head, also the hit box is significantly smaller sticking to a single head, making dodging easier. I've not completed Spirit but I've 1-life'd Saber keeping a single head the whole game, it's way easier this way. Also if you're referring to a longplay on YouTube, beware of the channel 'world of longplays', 99% of their replays are fake, they use save states and re-record. It's so blatantly obvious it's insulting that they don't even mention it in the description. The most blatantly obvious one is their 'longplay' of the arcade game Dragon Blaze. The way he dodges the bullets shows he has zero knowledge of the game and he hangs around the centre of the screen and does impossible dodges and barely uses the dragon shot (the whole point of the game...), that if you'd play the game you would NEVER play it like he is in the video. Strangely no one in the comments can picks up on it, so bizzare.