As soon as 10 o'clock arrived, all teams moved out. Those who made an alliance went somewhere together; others who decided to run alone tried to go away. Obviously, some followed other teams they thought to be good targets. And since Krune's group had only three members, they had immediately become some of those team's targets that were being pursued. The rules only said you can't attack anyone during the first two hours. They said nothing about not following potential targets.
Of course, Krune and his team noticed them straight away, but that was also good. It meant that those contestants weren't confident in a good five vs. five battles, which means that they are the real prey in the story. His group had purposely lowered their speed so that the contestants behind them could follow. At the same time, it wasn't so slow not to make their enemies think that they were being lured instead.