(More of this weird story)
Part Two: The Plan
A chase is a simple process while it is happening. What makes success more likely is the plan. Any being can run fast, hoping to outrun a target; though it is inefficient and usually ineffective. The approach is the biggest factor in a chase, and planning it well is what counted.
The being was not moving much from where I first observed it. Assuming it remained near that spot, I could plan. My options were limited mostly by my starting point. The high space with brushes and trees hid me. The ground between me and the being descended quickly before flattening out into open space; offering no places to hide along the way. Getting very close and lunging out would not happen. The plan would have to be about using the ground and tricking the being.
The patch of water was a good start. It did not look like a water being, so that was a boundary. The open space went on for a long distance, directly away from the water. On the other side of the being, the open space was also long; but there was a boundary of trees and bushes that could offer an escape, if reached. In a straight run, it was unlikely I could get close enough, fast enough to outrun it before it reached those trees.
If I moved far enough along my current cover and approached from a wide angle, leaving a gap to escape back to the cover I was in, the being might run for it. This cover was a good screen, but not enough for hiding or evasion; if the being panicked or misjudged this, it might run that way. I looked for another moment to see if there were other options before deciding on the wide approach.