Why is the Buddha described as trackless?

In the Dhammapada, within the Buddhavagga section, the Buddha is described as being trackless. > By what track can you trace that trackless Buddha of limitless range, > whose victory nothing can undo, whom none of the vanquished > defilements can ever pursue? > > By what track can you trace that trackless Buddha of limitless range, > in whom exists no longer, the entangling and embroiling craving that > perpetuates becoming? I find the notion of the Buddha being trackless very evocative. But at the same time I'm not sure exactly what it points to. Can someone help me unpack that a little. What qualities of the Buddha does trackless point to?