Source: Merlin Season 4 Episode 13 Guinevere vs Morgana
As you can see, this scene is very important. Although this fight scene is not the best like in Harry Potter or Lord of the Rings. But this shows how courageous Guinevere is, and why she's worthy to be a queen and this scene shows that Morgana still cares about her, but it's fate and Morgana knows that her betrayal will betray her because of fate, that's why Morgana make her decision to fight Guinevere as destiny.
Danny: Ha...ha...heh heh...Ha Ha Ha.. Aha HA HAHAHA!!
Homura: Danny you.....
Punch: ................
Danny: It’s true, I can block out the pain! I don’t feel any pain anymore! This is what it feels like to be the fully ghost!
And that's what it means behind Danny's words.
Sonic: Daniel....! Your eyes and your pact....!
Danny: The balance of hope and despair in the world cancels out to zero. Now I finally understand what that meant. Sure, I managed to save a few people, but in exchange, hatred and jealousy filled my heart. I even hurt my best partner...Whenever we pray for someone's happiness, someone else must be cursed in exchange... Turns out that's how this world works and also the hero of justice...I...really am...
*Sonic rushed to hug Danny.*
Sonic: You're not stupid! You're not a failure! I know what you're feeling now "Danny"! I felt the same way. I was once like you! You wanted to kill me right? I understand! I also once tried to kill Punch and Peter with my own power! That time I couldn't control myself my curse was far too strong! I felt like I was torn apart and don't want to live anymore! You have value! Value no one else has! I declare it here and now. In the world, I have two partners right here and now! So that value will never change, for all eternity!
Danny: Sonic...you.....
Hero of justice is nothing but a hell to walk to. Nothing but losing someone you love and change your life forever.
Makes you become nothing but a selfish person.
Danny: Whenever we pray for someone's happiness, someone else must be cursed in exchange... Turns out that's how this world works and also the hero of justice