Basically, everyone was going. That was the line that Killua drew. Well, he couldn't be the only one to stay behind so he had no choice but to go along. "Alright, I'm going to," Killua announced. He didn't know yet exactly where he would stand in the group's formation. They were such a perculiar bunch, the mismatch of their party caused him to consider if they even needed on. Killua was particularly fast so he felt that he would be probable either in the very front or back. In the middle he would have to worry about someone standing behind and in front of him, effectively restricting his movement in those directions. Of course, Killua could always jump above. He was a bit acrobatic. Feeling confident that they would be fine, Killua prepared to take a step and initiate the beginning of their scouting trip. 

Then he heard it. A dreadful noise that attracted the group's attention as if it were a fireworks display.

At first the sound made Killua uneasy. He didn't say anything to express his concern, but he did tense up in preparation for a possible conflict. [i]I haven't fully recovered enough to use nen,[/i] Killua thought, analyzing how he would act in the event that this was indeed a combat situation. [i]I'll have to use another means.[/i] Killua reached into his pockets and whipped out a pair of rather unconventional weapons - two small spherical objects with strings attached. While he was sure that everyone else in the group would mock him for his choice in weaponry, Killua would pay the taunting no regard for he knew the secret of his weapons. They were reinforced with fine metal. While they were certainly heavier than standard yo-yos, a whack upside the head with their increased weight was potentially enough to crush a skull.