For the Scourge!
Natasha’s interaction with Selvig where he says he thinks he did know what he was doing and built the safety. Perhaps it’ll be Sigyn who reveals what the safety is, ‘cause perhaps Loki told her.
Black Widow/Natasha: Are you here to try and stop me?
Sigyn: Surprisingly no. I’m going to help you. Selvig built in a safety.
Selvig: I did?
Sigyn: Poor thing, yes. Loki manipulated you into building it. That little voice inside your head that told you what a good idea it would be? That wasn’t you.
(с) Eventual procrastination