Swapping of Mic

I've recently notice that Arashi tends to swapped their mic with one another, namely Sho, Nino and Ohno. it often happens all throughout their concerts but in japonism you'll clearly see that Nino and Ohno exchange theirs after they're nearly finished with their MC.

I often wonder as why is that? hmmm.. it's really mind boggling for me but oh well :).

As you can see in the picture, they're holding their mics with their distinguished colors






After that ohno and nino exchange theirs (^_^)