The Phage has spread to your left arm joint. Inject EXAs into the Phage components to relay messages as your nervous system would and allow you to use your arm.

"Read a value from the nerve connected to your central nervous system (CNS) and relay it to the nerve connected to your arm (ARM), clamping the value so that it never goes below -120 or above 50. Repeat ad infinitum. It is not necessary to leave no trace."