Last year I found out what happens when the coyotes find a grey fox in your leg hold. A mess of a scene with a grey fox leg caught in my mb550 but no fox just a front leg. Bloody mess everywhere and a unreal blood trail where they carried it off. I had a jip yote caught in the next trap 30 yards away and the other fox in a set a couple hundred yards away. Later in the season and several foxes later I had a nice grey caught and the next two sets on the line both yielded coyotes. When I skinned that fox i found he had survived a fight likely with those coyotes as he had been bitten hard all over.
It's quite the fierce reality out there, unless a person is a part of it and witness it they might be quite surprised by the predator/ prey twist.
I've seen mink and muskrat fight to the death, it's rough to watch but everybody has to eat.
Congrats on those Greys.!