 कथं त्वं कर्मणा शक्तः कैकेयीवशवर्तिनः।करिष्यसि पितुर्वाक्यमधर्मिष्ठं विगर्हितम्।। 
  When you are able to counter this move, why do you want to execute the unjustifiable and contemptible words of the king who is under the spell of Kaikeyi?  