When I charge in to the boss I notice that sometimes I charge up to the boss, sometimes I go through the boss but am still facing the direction I was facing, and sometimes i charge and then find myself on the other side of the boss flipped around.

Is this just a random thing (force/distance from boss etc.) or is there something in the way I position myself when charging, or something I can do during the charge travel distance that can influence this.

My impression is that it was random last night, but some pulls did have army of the dead agroing the boss just as I charged, so that may have been the variable.