It's tough to determine. Douma has raw power, but Shinobu could use her wits and special abilities to gain an advantage. The outcome really depends on how the battle unfolds.
If the prince died, it would be the second chapter of Sword Snow Stride "," Sighing that the sword of the Lingjiang River can break a thousand armor, laughing at the cold blade hanging on Guangling."
I have uploaded chapters 124 - 153 of the Ringbearer manga to the attachment. You can download and view it. Please note that this manga only contains 153 chapters because 124 chapters have not been released yet.