And then at the end, the dragon grabs Constant in his mouth, and flies up into the sky
Constant grabs his blade, and you have to stab it in the face repeatedly while still in its mouth
After enough time, Constant stabs it in the eye, which makes it loosen its jaw, Constant breaks out, climbs onto the top of its head, pulls the sword out of his eye and you get to spam the attack button to try to shove the sword into its head
Then Constant jams the sword into its brain, and forces the dragon to dive headfirst into the ground