It's obvious there's a kill there, and the wolf wants the bear to leave so it can have it...
I was out on the tundra on the side of a small hill one time, watching a grizzly. I watched it quite a while slowly moving along, when I then noticed a wolf tracking the bear, I could see both of them, but they couldn't see each other. Anyway, the wolf kept tracking the bear until it got quite close, then they just stood there staring at each other.
Finally, the wolf walked closer, it's nose stretched out, and the bear stretched out too, until they touched noses or nearly did so, smelling each other. Then just like that, they both turned and walked off in opposite directions.
I thought that was interesting....
DM