Bucky's still not huge into this whole war thing, but the Seelie really did piss him off during the battle by setting fire to the forest and shit, that wasn't cool, and damn he wants those Dullahan as far away from Ariadne's place and the Station as possible, so he will gladly lead them to the Citadel, and then hang out and kill some Seelie while he's there, why not.

He... can also turn invisible at night, and he's very sneaky, so... he might be slightly OP??? If anyone wants their ass kicked by an invisible assassin, hit me up. HE ALSO DOESN'T HAVE TO BE INVISIBLE, he'll just probably be doing most of his damage at night because hahaha fuckers