Yamcha and Krillin Enter the Battle

"How could there be four of them?!" King Piccolo's expression changed drastically as he stared darkly at the four people flying toward him through the sky. In his Ki perception, he had sensed only three people. Seeing an extra person whom he had failed to detect filled King Piccolo with a sense of foreboding. He had never encountered such a situation before. Someone was using Ki to fly, yet he could not sense that person's Ki at all? Why was that? King Piccolo felt both puzzled and wary.