This was a two-way Relocation Rune. It connected two places, allowing people enter and leave through either of the sides.
If Su Ming had stepped on that meteor just now, then since the Rune was in constant ready more, once it went into operation, he would have been forcefully relocated to a specific region, and the powerful warriors from the Yu Family in that place would have attacked at the same time.
Su Ming might not have discovered that there was a Relocation Rune contained within the meteor, but he had determined that there was something off based on the old man's actions.
The other's attempt to hide was too fake in Su Ming's eyes.
However, there were some strange aspects to this sort of concealment. Su Ming had indeed been unable to discover the man even though he had scanned the area with his Atman, just like how he had been unable to discover the Relocation Rune.