It didn't take Lin Mu more than a few seconds to calm down as he could not afford to take any longer time. He was in a sensitive situation and needed to act quickly. He spread his spirit sense around again to check for anyone else that could be in the area and found there to be no one in the twenty meter radius.
Having confirmed this, he switched to a single tendril of spirit qi and scanned a wider area of a hundred meters. This time a few people appeared in his range. Lin Mu had been careful while using his spirit sense, as he did not want to alert them by letting it touch them.
Lin Mu had used a different method and had sensed the faint fluctuations of spirit qi coming off their bodies instead. While this allowed him to see that there was a person there, he couldn't tell their appearance as he wasn't actually touching them.