After Xiang Yu got rid of the attacker's body, he got back to training. He also made sure to have his qi sense on the lookout so he could make a run for it in case someone even more powerful came. Instead of continuing to practice the elemental palm techniques, Xiang Yu first studied the new Lightning Strike technique.
This was because he wanted to see if he could get some insights on the lightning element by practicing the technique. That way, he would be able to create a sixth elemental palm technique to add to his growing collection.
Studying the Lightning Strike technique wasn't that hard. Xiang Yu already had some knowledge of the sword, so it was quite easy to pick up the basic movements and energy pathways. The illustrations in the manual showed precise positions for channeling the lightning energy through the blade, which he followed carefully.