Some individuals in Kumo would know about Chidori, though they'd probably call it something else. (http://naruto.wikia.com/wiki/Hell_Stab)<br/><br/>Hell stab, I think, for all intents and purposes, is Chidori. Tarui might know something about it, so I take it Jin-Ryu's training with her? As an aside, it's only one day... BUT you will have a whole month after the second stage to continue training. It's extremely dangerous because of the chakra cost, but technically you CAN train during the week-long second stage as well.<br/><br/>Also, because I realize how imbalanced the choices are.. fuck it. +5 situational bonus to training with team mates, to match the mentorship bonus.