The first spot Kong reached was the deepest point of the hole in the middle of the garden.
He knew to leave behind such a deep scar, a formidable attack should be used there. And that was why he selected this spot to first examine it.
He released his spirit power and started to feel the area in a thorough way. What he found was something he wouldn't mistake, and it even managed to change his face as a look of real shock appeared.
Elements like fire, wind, earth, and wood were considered common elements. They were found anywhere, and most of the spirit masters and families were able to use one or more of these.
Just like Kong's family and clan, they could use the fire element, with variations of spirits that could use earth and wind elements. But elements like lightning, ice, darkness, and light were considered extremely rare and pretty much precious.