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You'll find him in the convention centre's main hall. You'll want to run all the way to Marchenko. If you saved Allison back in your second visit to Prague you'll have the Bomb Jammer device this can be used to buy yourself some extra time. If you take too long to get to him, Marchenko will pull the trigger and kill the innocent people unknowingly sitting on bombs. You'll have ten minutes from the moment you regain control of Adam to get to Marchenko and stop him. Read on: If you go to stop Marchenko first:
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This will save his life, but will also in turn impact what you should do next. If you speak to him again, you have the opportunity to use the Orchid antidote on him if you have it from choosing the bank over Allison. When you're first presented with this choice you're next to Miller, who is in a bad way. The game is a little cheeky: it presents this to you as a one-or-the-other choice, but if you're quick, it's actually possible to do both. Innocents will die in Marchenko's bombs, but thousands of augmented could be saved from further discrimination and dehumanisation. Or Adam can head to save the important political leaders who have the power to stop the anti-augmented policies that are currently being pushed from being poisoned - another part of Marchenko's plan.