To activate the Janus mode, the user must inflict 5 hits (means that each user's fire must hit an enemy, this is to avoid spamming).
Its Janus form lasts for 7 seconds.
Its Janus form can be activated even by shooting all 5 rounds on teammates if Friendly Fire is on.
This weapon is not recommended for a Boss fight, because it deals little damage even if the Janus form has been activated.
There's a trick to save the Janus Transformation System, once it's ready just switch to another weapon and when you are going to use it, just switch it back and quickly activate or it won't take effect.