Board Thread:Naruto Discussions/@comment-24165784-20151108230957/@comment-25122992-20151123204726

Well, it was the case of the Reaper Seal: Release, which has it's own mechanics. In the case of the original jutsu, everyone aside from the user and already grabbed target is not able to see Shinigami. The jutsu can be identified only through the hand seals which the user performs.