These comments...
Obviously, he want to protect the girls , but he still need the stupid asshole alive if he want to talk with his father/sell the high value ring and maybe get a huge reward.
Problem is, he just really underestimated this assassin and took it lightly, something the assassin didn't do, even attacking others people to weaken Douglas.
And now Douglas had a poisoned knife in his body, he need to end the fight fast before he's out cold.