12-01-2018, 05:49 PM
(This post was last modified: 12-01-2018, 05:53 PM by FaceInTheCrowd.)
We should probably assume that none of the usual theoretical "rules" of science fiction time travel apply to Grimm, because the series takes place in a universe where magic is real. Maybe all Nick really had to do once he became the owner of the staff was wish that everybody Z killed had never died.