Mating injuries?

Kind of a longish backstory: I have 1 call drake, 3 female rouens, and 1 female khaki. I have no clue if the call is even capable of trying to mate with the females since they’re so much larger, but I have seen him try but it always seemed mild and he gave up after a while.

Anyway. This morning I noticed my khaki had a chunk of feathers missing from her neck. No bleeding or injuries, I didn’t get a pic, just took her inside and cleaned the area and checked it out. She’s acting normal, and doesn’t seem upset. All the others are okay. If it was a predator attack wouldn’t more damage be done? Does this sound consistent with mating injuries?