Not every frame out here is a predator. Most of the Serengeti is grass and the animals that eat it, and the zebra are the ones that photograph best doing nothing, stripes sorting themselves against the dry plain.
The antelope had found itself a lookout, up on a pile of boulders where it could watch the track and everything on it. A small animal making itself the tallest thing around, which is a sensible way to live in a place full of things that want to eat you.
Both on the 135, base ISO 64 up to 400. The gaps between the big sightings are the real texture of the place, and worth keeping frames for.