Homura knocks Sayaka unconscious and gets Ky?ko to leave, before reiterating to Madoka that she not get involved. Kyubey mentions to Sakuya about the potential Madoka has to become a Puella Magi, although she insists that she doesn't want her to get involved. Homura later confronts Ky?ko and offers to let her have the city, mentioning that Walpurgis Night is approaching in two weeks. Meanwhile, Madoka becomes concerned about Sayaka, who ignores her pleas to try and just talk with Ky?ko, also showing hatred towards Homura, believing all Puella Magi besides Mami to be selfish. The next evening, Sayaka is once again confronted by Ky?ko who goads her into another fight on top of a highway bridge. However, before the battle starts, Madoka arrives and takes Sayaka's Soul Gem, the source of a Puella Magi's energy, throwing it off the bridge in the hope of stopping the fight. However, this causes Sayaka to suddenly become lifeless, shocking both Madoka and Ky?ko. Kyubey reveals that as part of the contract, the Soul Gem literally contains a Puella Magi's soul, while their body is a mere shell that becomes lifeless if the Soul Gem is more than 100 metres away from them. Homura rushes to retrieve the Soul Gem and brings it back to Sayaka in order to revive her.
-Wikipedia
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