When you see someone hxc dancing, They are fighting invisible ninjas so to speak.
I see an army of invisible ninjas in the mosh pit tonight. Who will stop them?
What some rappers, most notably Devlin fight whilst rapping - Moving their arms around like windmills trying to look "street" they look like they are blocking attacks from invisible ninjas
Dude! Why are you fighting invisible Ninjas! Stop flailing your arms around like a windmill.