A clash happens when both players hit each other with a ninjutsu at the same time. Nnjutsus are performed by hitting
. I did this with 2 controllers. I picked Neji for both because they would have the same ninjutsu and would be easy to time. Have both players standing next to each other. Then simultaneously hit
on both controllers. Done right, you should enter a clash. Then just mash
to win the clash.