GRENINJAS FIRE SHURIKEN EXPLAINED IN DETAIL

Hi Pokemon lovers,
Today I have my very own explaination behind greninja's new move which you guys probably know as the fire shuriken
Here is how it works:
1. The shuriken spins in a very very rapid speed causing the flames or the red/ orange colour to show up. It's like when talonflome uses brave bird the speed is incredibly awesome which causes the flames to appear. Same with staraptor.. Here is an image:

                                                                                 
SO IN CONCLUSION : ITS ALL SPEED