At the start of the episode when John regains consciousness he goes over to Kai who is lying in the rubble unable to move and she tells him to go. He then chases after Makee but runs into Vannak who is holding a gun to Kai's head. Kai is somehow wounded in the rubble and standing up unscathed some distance away at the same time.
Master Chief puts Kwan Ha under the care of Soren, but never came back to pick here or meet her or not even inquired about her via means of communications. He had totally forgotten about her. She was under Soren's care and still, without taking permission of Master Chief, without even informing him, Soren takes her to her planet where she faces so many problems and came to a hair's breadth close to death. That is not how one should nurture a ward.