Luke made a senseless sacrifice
Really! He desperately wanted to die so he can (escape from this show ) atone for his crimes, and the twins needed someone to die just an hour or so later. So, they could have used Luke as the conduit. Also they mentioned in one episode that the second wave will be a lot worse than the first, and Malina did pretty good against the second one. So by all accounts she should have been more than capable of taking care of the first blast.
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