Ahsoka has to fight clones and police officers while she's on the run. To illustrate the fight, we see her shadow on a wall with the shadow of her lightsaber. The blade of the lightsaber is composed of a form of light, not matter. It wouldn't project a shadow on any surfaces. It is similar to the principle that the fire has no shadow on a lit match. See more
Ahsoka Tano on the run! After an attack on the Jedi Temple, Anakin Skywalker's young Padawan found herself accused of murdering the person responsible for the bombings. With no choice but to run, she was chased by her Master, who begged her to turn herself in. Knowing there is little hope of being cleared of the crimes, Ahsoka decided to find out the truth and prove her innocence on her own...