There were several reasons why Shane agreed to teach Lysandra… First, he was curious about her skills and talent. After all, even A.I. Cloud failed to sense her presence. The other reason was that he needed to know more about this shelter since, later on, he would be helping them fight against the Giant Zombie.
He needed someone who would tell him more about that, and this woman who belonged to the combat team of the shelter would be good enough to provide him with information. Aside from that, he also needed to practice some of his survival skills since he was planning to use double hatchets as his main weapon.
"Great! It's my first time seeing a very strong Survivor… My instinct was telling that you're at least in the top 100 Survivors in the Leaderboard." Lysandra said.