The shot from the bow to the control room is the most difficult to make on the RS maps. Only with the 20X can a shooter properly see the very small targets presented, which are often only heads. The Barret .50 also has an exceptionally slow reticule, because the gun weighs an enormous amount. This means that unless a shooter is both stationary, and has enough time to allow the reticule to settle on the target, it is extremely likely that the shot will go wild, and with the reticule of the Light Fifty, a second shot is not an option. A major advantage, in this case, is that the shooter in the control room doesn't necessarily need a .50 cal to hit the target.
Next lets look at reticule speed.
A fast reticule can be an enormous advantage if the sniper knows that its likely he'll receive fire when he pops from a hiding place. With that in mind, lets look at the various rifles, with the actual programmed reticule speed value. This means that the Walther is the sniper rifle you can settle on a target fastest, an important property if you know there is an enemy sniper probably targeting your approximate position. Skilled shooters with a Walther, even with its lower accuracy, can routinely log more kills and fewer deaths than with any other rifle by virtue of its speed. Many argue that uniforms are essentially irrelevant, but in a sniper-fight, they can slow the enemy's acquisition of your position by a noticeable amount.