How did Jonas know they were looking for him?

Answer 1

Jonas knew they were looking for him because he could hear the search planes overhead, which were using loudspeakers to call out for him. Additionally, he felt the urgency in the community’s atmosphere and sensed that something was amiss, heightening his awareness of the danger he was in. His instincts and the ominous presence of the search efforts confirmed to him that he was being actively sought after.