The point that was being made is that on a sphere, the shortest distance between two points is not a constant bearing rhumb line (unless you are following a meridian or the equator). It is always going to be a great circle path from A to B. If you follow a constant bearing rhumb line and keep going, you will always end up at a pole. The trek through the woods was just to illustrate that when you move from A to B by line of sight alone, you are technically not keeping a constant compass bearing.
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