Jeanne and the others had landed in Poland, and they were unwelcome by the government. The government and the Awakeners and the Chosen Ones were trying to force them to leave. Since Jeanne was the leader, she was the one who gave the order, and she had no reason to listen to their threats.
"Kill those who raise their weapons at us, and do it quickly," Jeanne said as she looked over her shoulder to look at her team.
Lexus and Nexus with their team were more experienced in this kind of scenario, and so they took the first move. They killed the soldiers, Awakeners, and Chosen Ones before they could even do anything.