When I found the dead Assassin inside the hospital I saw that he was trying to press a switch in front of him. So Batman also tried to press the switch. But as soon as he touched it Batman got an electric shock.
After that Batman turned on his scanner or Detective Mode. He started checking the whole area carefully. After scanning the area one important thing was found. It looked like the Assassin was not trying to press only one switch. He was trying to press four switches in a fixed order.
Then Batman went to another switch and tried to press it. But he also got an electric shock there. At that moment Batman understood that he could not press the switches any way he wanted. He had to press all the switches in the right order. If he pressed the wrong switch he would get shocked again.
Batman used Detective Mode again. He followed the blood marks and the path of the Assassin. In this way he found out which switch the Assassin tried to press first and which one he tried after that.
Then Batman started pressing the four switches in the same order. This time there was no problem. After he pressed all the switches correctly a door near him opened.
When I entered through the door the whole place looked diffrent. It looked like I had entered a cave. Batman moved forward slowly. After going a little further he looked down and saw many members of the League of Assassins sitting there. In front of them a man was sitting on a big chair.
When Batman went closer he understood that the man was none other than Ra's al Ghul. The most shocking thing was that Ra's al Ghul was already dead. But somehow he was brought back to life with the help of a strange liquid or the power of the Lazarus Pit. This did not feel normal at all. Bringing a dead man back to life felt like something against the rules of nature.
Then some Assassins pointed their swords at Batman and got ready to attack him. But their leader stopped them. Instead he wanted to make a deal with Batman.
He told Batman that they had found another new Lazarus Pit. This serum could make Ra's al Ghul fully healthy again. If Batman brought the serum to them they would take Ra's al Ghul and leave Gotham.
At first Batman did not agree with the deal. But then the leader gave him a threat. He said that if Batman did not help them they would keep killing innocent people in Gotham.
The lives of normal people in Gotham were very important to Batman. So in the end he had to accept their deal. Now his new mission was to get the serum from the Lazarus Pit.