Who is broken shadow in warriors?

Broken Shadow is the mother of Fallen Leaves in the Ancient Clans by the lake. I know this does not really answer to Broken Shadow, but Fallen Leaves was a softpaw in the Ancient Clans and he went to the underground tunnels beneath the territory to become a sharpclaw. He sees Rock with his stick, who tells Fallen Leaves what to do in order to try to get out of the tunnels by dawn (See 'Rock'- 'who is Rock in warriorcats?'). Fallen Leaves blindly crashes through the endless tunnels, making several useless attempts to get out, trying to rely on his instincts. At the beginning of Jaypaw's vision, one of the cats who were wishing Fallen Leaves good luck meowed, "There is rain on the wind." Whenever it rains, the water falls down the tunnel entrances, and the river in the main cave floods. Fallen Leaves had unfortunately chosen to become a sharpclaw at one of those times. The tunnels flooded. And when Broken Shadow realized, she was devastated.

Fallen Leaves had entered the tunnels, but he had never come out.