Wuwuwu... They really had it tough. When they arrived, they saw the little girl surrounded by six little kids. At that time, they couldn't help but take notice. After a quick observation, it seemed like only the older boy who looked slightly older than the girl was close to them.
Seeing those six chubby, adorable kids, they liked them so much that they didn't spend much time observing before deciding on their target. Firstly, those two older kids didn't look that old, so they reckoned they'd be easy to trick. When the scene got chaotic, they'd likely lose their composure, which would make it easy to succeed.
Secondly, with those two semi-adult kids leading six littler ones, they figured their group had the advantage. Even if they couldn't take them all away, grabbing two or three would still bring them a huge profit.
They had done this kind of thing many times before, and originally thought this time would be even easier. But they didn't expect to kick a steel board.