How did Shivaji attack Shaista Khan?

The Mughal emperor, Aurangzeb appointed his maternal uncle, Shaista Khan as the governor of Deccan with the instruction to destroy the newly established Maratha power. Shaista Khan took the possession of Poona. Hearing this, Shivaji reached Poona with his chosen troop and entered in Shaista Khan’s camp. Shivaji reached Khan’s room and made a surprising attack on him. Shaista Khan was asleep and got up, and tried to arm himself when the attack was made but he managed to escape in darkness by losing his thumb. Meanwhile, Mughal troops became alert and awake; Shivaji with his soldiers left the camp immediately. Night attack on Shaista Khan brought prestige to the Shivaji while Shaista Khan was humiliated.