Marchenko knocked out something? (Deus Ex: Mankind Divided)

Help pliz, after saving the delegates, or whoever they are, went down to Marchenko, he began to blow up a monologue about everything, at the end there were options how to be, and one of them was turned off by the device! I chose him and then Adam got something similar to electronic master key and Machenko passed out!
The question is, where did I get this thing? I climbed everything there before, where I did not know?