Board Thread:Theories and Speculation/@comment-28717679-20160611095118/@comment-25122992-20160611162639

Rachin123 wrote: You don't have to master it, just be able to perform it. Like Sasuke could copy Lee's speed to a degree, but only lasted like 5 minutes due to his body not being uses it and quickly wared out. Yeah, something like this. I just meant that to copy a jutsu of a particular element, you must learn to use this element beforehand. That's why the Sharingan users cannot copy Kekkei Genkai techniques - they actually need to possess the particular KG, which usually isn't the case. Sharingan's copying ability is pretty useful think, but still it doesn't allow you to copy something beyond your own capabilities.