mostly to show that the pylon-like devices on her back are in actuality a type of weapon system.

Since Bunnie has a preference for hand to hand combat, her integrated weapons are specifically designed for just that.

In full battle mode the two pylons can detach themselves from her back and overlap her normal limbs to form a pair of oversized manipulator claws capable tearing steel (or a hapless swatbot) like tissue paper.

They also have a type of piston style weapon system that enables bunnie to add additional force to her punches.
(up to 5 times her normal robian strength)

It could also be used as a type of defensive weapon as well, causing a massive tremor if the punch is directed to the ground, perfect for knocking any would be attackers to the ground.