Hellfire
The Panda should be dead. After being caught in that explosion of Shen's cannon Po should should have been burnt to death in a flash of red fire. Instead, he lived. Terribly wounded and unable to fight back, but alive.
As Shen approached the wounded panda he thought of just stabbing Po with his sword right then and there. But seeing Po laying there, looking at him with half lidded eyes full of pain, something in him suddenly made him desire to keep the panda.
Suddenly he wanted to see Po cower before him, and eventually serve whatever whim Shen desired. Sp instead of stabbing Po, he lifted the butt of his sword up. The last thing Po saw before being knocked out was the odd smile the crested the peacocks beak. It made Po shudder before he was hit with blackness.