I guess Hamlet wants Horatio to hurry! Of course he’s assuming that Horatio would be in a hurry to get away from death. Would Hamlet himself want to flee death with speed at other points in the play? Well, yeah, actually, he would. For all the melancholy Dane talk, Hamlet spends most of his time avoiding death.
But there are characters who would not be inclined to hurry away from death. We don’t know a lot about Horatio – but I suppose we can assume, the way Hamlet does, that Horatio would like to avoid death, like most of us.
The Hamlet Project 