Board Thread:Versus Debates/@comment-34277398-20180327041446/@comment-26107879-20180329031219

@Lorenzo

Incorrect. Mangekyo is supposed to be a form of Fire Release. And Fire Release would mean it requires Chakra, obviously. So just looking and poofing is not all it takes. It also seems the user bleeds before the usage as well with their eye widen. This could also be a requirement or even an effect of the Chakra charging up. Either way, it requires Chakra and thus a charge up is needed. Whether it be a millisecond or a minute, if it uses Chakra, it has to be manipulated to form the jutsu.