The first victim of his scheme

Inside the cave. 

When lord Darth saw this he took the opportunity and tried to pick up the sword.

Surprisingly he managed to pick up the sword with no struggle. A smile broke out of his lips. He never thought his plans will happen Smoothly.

It was a known fact that the fire at the entrance of the cave will come up at a short interval, so one would have to calculate it properly before stepping in or out of the cave.

Lord Darth has dared to set up fire because he believes that no one will question what happened to the prince if he got burnt. Some will just think that the prince had miscalculated while others will see it as the work of the gods. Either way lord Darth had nothing to worry about.

Lord Darth also believes that because the prince has been delayed by the fire he created, the heavenly fire has burnt the prince to death. He was so consumed by his imagination that he did not consider the important point.