Zhang Tie didn't mean to eavesdrop it; nor did he extend his spiritual energy towards that place on purpose. However, with the "overflow" effect of his strong spiritual energy, he could easily sense any sound or wave in the air within hundreds of meters.
On this occasion, Zhang Tie could receive enormous information. To put it simply, the total amount of information that poured into his ears per second could make commoners feel dizzy and crazy.
Imagine how you would feel if you could hear the talks of hundreds of people, twitters of hundreds of insects, birds, cockcroaches, rats and fleas, intestines wriggling, blood running in blood vessels, hearts beating, earthworm creeping in earth, worms chewing the fibers of twigs and sucking juice of leaves, rats mating, birds' feathers plucking in the air, fleas moving in animals' furs, fish bubbling at the bottom of river per second incessantly. That was how Zhang Tie felt spiritually on that occasion.
