If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
The PX-41 serum transformed the purple minions into Evil Minions and they became destructive, mean and very hungry. One of them got mad on a yellow minion and started to hit him. The yellow minion got beaten and now he has to rush to the ER. At the emergency room you have to heal the minion's wounds and help him recover as good as possible. Be a great emergency doctor and make the minion healthy again!