While the return of Katana in the present day was shocking enough, the wording used here by Maseo ("I asked her to come here...so she could bring you back to life") is particularly interesting. His wounds appeared to be far too severe to be brought back by conventional means, so is Arrow about to introduce some mystical elements? Ra's al Ghul has already indicated that he's hundreds of years old, so perhaps Katana had access to a Lazarus Pit? Share your theories below.