Mahabharat S03 E11 Bheem is thrown into a river

Drona informs Dhritarashtra that he will teach the Pandavas and Kauravas, along with his son, Ashwatthama. But he refuses to teach them in Hastinapur. Shakuni and Duryodhan push Bheem into the river. Kunti realises that her son is in danger. How will she save him?