This chapter didn't quite feel right-- the general setup has him wanting to work with other people as opposed to living alone in the cave, so he helps out by utilizing his unique skills to reshape the battlefield into a hugely advantageous form. Then it throws out the pretense of partnership by showing that he could've singlehandedly stopped the entire onslaught without much fuss, and he even had to take care of their injuries too. Time to see how the boss fight is going to play out, though.