Friendly fire is active on the servers of League Play, consequently, the less attentive risk damaging even their friends in the shootings. This mechanism adds an extra layer of tactics to matches, but there are some players who take advantage of this to deliberately disturb and kill their teammates. For this reason, with the February 13 patch Treyarch introduced a new rule that turns friendly fire into rebound damage: after the second teamkill, all damage inflicted on your teammates is transformed into rebound damage, which damages the 'striker. Also, after the second teamkill attempt, the perpetrator is automatically kicked out of the game.
The February 13 patch also added another restriction to League Play, deactivating Scorestreak RC-XD, and fixed some Zombies mode issues, such as teleporting players off the map to the Village area and the exploit allowing users to position themselves on the build table. Speaking of Zombies, according to some rumors a new open world map is coming.