Ever since they spotted him, Leo acted oblivious to the fact that they are stalking him.
If they knew that Leo had spotted them the minute they stepped into a range fifty meters away from Leo, they would be shocked, because it's a known fact that only cultivators with spirit sense are capable of such a feat.
'So the man set his hired mercenaries, huh? He is lucky that he did not come himself, as I would have made sure to kill him on the spot. Fortunately for him, I don't have his time, or I would have made sure to kill him once am done with these mercenaries'
Leo had been walking at a normal human speed when he walked out of the vendor's place, he had been doing it like this because she was waiting for the vendor to take action.
If not for this, Leo could easily carry his sister in the princess style and run out of that place at full speed.