The white region was just evaluated as an objective region. Katya has two tokens (2 + 1) in the region, and Viktor has one (3). One of Katya’s tokens is then flipped to the exhausted side. Viktor’s token and Katya’s remaining token, which were both already on their exhausted side, are removed from the game board. Viktor’s removed token is a unit token, so it returns to Viktor’s supply. However, Katya’s removed token is a leader token, so it is removed from the game instead.