Nathan felt rather disoriented while leaving his target location. During his subsequent exploration, he discovered that there were more than just four members of the Blood Clan in the building. On both the second and third floors, there were figures of the Blood Clan who had fallen to their deaths, totaling about seven or eight.
It seemed like there was a little gathering of the Blood Clan the day before.
This was unexpected for Nathan. If these Blood Clansman had not run into trouble, Rob Williams could have met with a group of low-ranking Blood Clan members after barging in through the window on his hunting mission.
This could have been a deadly situation.
He was self-aware that he couldn't even take on a low-ranking Blood Clan member in a head-on encounter without a surprise attack, let alone face a group of them.