Fern and her party consisting of Übel and Land manage to catch a Stille and decide to lay back due to the threat from other mages who may want to steal their bird. After discussing with Kanne and Lawine, Frieren hatches a plan. They decide to freeze the lake within the testing grounds while infusing smaller pools of water with mana. Because the Stille are very sensitive to mana, leaving a single pool uncontaminated ensures that the Stille will flock to it by default when they are thirsty. Elsewhere, Denken's party observes the water freezing done by Lawine. Denken determines that Frieren's party must have a plan up their sleeves and decides they should pursue them to steal their Stille. Another party consisting of Ehre, Wirbel, and Schraf ambush Fern's party as they attempt to look for water and the two parties end up fighting over the captured Stille. During this fight, Frieren suppresses her mana near an uncontaminated pool of water and manages to capture an unsuspecting Stille. Denken's party detects her casting magic and they ambush Frieren's party to try and take their Stille. (Source: Wikipedia)