Specific fic hunt
I'm looking for an older fic. Arthur is captured, I think bound to a post, and Merlin rescues him using magic. Arthur stays kneeling when Merlin gets to him because he's in awe of Merlin's power, or something like that, and Merlin is horrified because he thinks that the captors have broken Arthur (when in fact Arthur is fine and mostly just besotted). Then they have to go find the knights and Merlin is casually fighting off assassins with his magic while having a conversation with Arthur (I think at one point he tells the assassins in the forest to leave them alone because Arthur is his).
Thanks in advance!