Leash allows a Puppeteer to synchronize multiple allies movements using Energy Thread. Energy Thread is used on an ally and the threads allow the puppeteer to influence their movements similar to a puppet on a string. The puppeteer does not completely control the movements of their allies but merely enhances them. This allows a group of fighters to fight as one and greatly increase their co-operative fighting abilities. This technique cannot be used forcefully as in order to leash an ally effectively they must consent to the puppeteers help. Leash most likely owes its origins to the interconnected nature of the arts of Martial Arts Theater as other traditional arts, which are kept strictly seperate from each other, are unlikely to have techniques to enhance the fighting ability of others.