CHUCK NORRIS can only kill himself with a roundhouse kick to the face
and on his face is a beard
and behind his beard is another fist
so therefore he CANNOT be killed by a ninja.
however if the ninja did somehow manage to time-warp chuck so he kicked himself?
game over
the thought is ridiculous. if a ninja ever fought chuck norris, the ninja would simply implode upon impact and the shockwave would cause every single woman within a two hundred mile radius to become impregnated instantly.
dont fight chuck norris.