I wrote a sword fight as pure metaphor. I don't know a darned thing about sword fights, but there is sound and flashes of light. To be fair, the whole thing takes place in the main character's imagination. It worked for this MG contemporary (Note the scene is imagined). For my YA fantasy, it wouldn't. Dark Star’s sword crashed against Bright Star’s. “I am evil.”
Bright Star’s sword replied, “I am good.”
“I am pain.”
“I am comfort.”
“I am fear.”
“I am hope.”
“I am hatred.”
“I am love.”
The blows fell hard from both sides. The sound of one sword melded with the sound of the other. They shared a voice.
“I am deceit.”
“I am truth.”
“I am death.”