608.4d.

If an effect causes a player with a turn marker to take an extra turn after the current one, that player keeps the turn marker and starts his or her next turn after the current turn ends, unless another turn marker is too close on either side at that time. If a turn marker is within three seats on the player's left, the extra turn waits to begin until the player four seats to his or her left takes the other turn marker. If a turn marker is within three seats on the player's right, the player passes the turn marker to his or her left when the turn ends rather than keeping it, and the player will take the extra turn immediately before his or her next turn.