If your lee get chaos'd after activating his mystery... he'll murder your own team instead. Unlike mb.. he does not have chaos protection sadly.

Extra attack before each action won't do anything if chaos'd, but extra standard attacks will take place if chaos'd. Swiping standards, or ones that ignore defensive skills do not take place if chaos'd. Since lee's standards are just regular standards.. he'll launch every single one of them at your other ninjas if under chaos.