Not necessarily.
The Reloader B and the Halo B both try to detect the firing of balls to activate the loader. They both avoid the delay that needs to exist for the Evo II and Revvy to activate.
The Reloader B does so by detecting the sound of the pb marker firing.
The Halo B does so by detecting motion in the ball stack.
In both cases, there is a spring tensioned cone pressing the balls into the breech before it even opens. I am not 100% sure, but I would imagine that the spring starts releasing it's potential energy nearly instantaneously.
In the Reloader, there must be a sound wave that moves from the maker to the sensor. In the Halo B, there is an ultra violet motion detector that must register motion. These arelimited to the speed of sound and light respectively. I would bet that in both cases, the spring is already propelling the cone to push a ball into the breech before the signal is detected by the board.
Of course, if you break paint in the neck with a Halo B, you can block the receptor or the light in the Motion detector. With the Reloader B, there shouldn't be any change, since the sound sensor will still "hear" the report of the firing cycle.