Yes, the delay is random. According to the manual, this was validated with experts Rabbis and is congruent with the way things should be done on Sabbath.
I mean breaking this commandment in particular is punishable by death. So I guess there isn't much choice if the religion is to have any followers.
But I'm waiting for the first person that, after consulting with expert clergy, comes at the conclusion that all they did was press the trigger. The gun and projectile did the rest, with great assistance from the target who decided to be in the line of sight :).