When Su Yu speculated that the Ghost Tribe's purpose was reconnaissance, he had already made up his mind.
"With the speed of the Azure Oath and my body having broken through to the six-star beginner level, I can reach various small settlements within just a few minutes. I can hunt down the reconnaissance soldiers of the Ghost Tribe in the wilderness without fear of any diversionary tactics they might employ. On one hand, the Ghost Tribe still hasn't figured out what's going on in the Dead Silence Wilderness, and on the other hand, I can return immediately in a very short time if there's any problem, thanks to the speed of the Azure Oath."
"Moreover, with my current level of Spiritual Energy, I can cover an area within a ten-kilometer radius around me. Combined with holographic perception and perception of killing intent, wearing the Azure Oath makes me a walking human radar."