The context of the following conversation is Aubrey knew that Riley had betrayed her. She deliberately filled Riley's tank with pure oxygen instead of the usual nonlethal mixture.:
Aubrey says I just found out that Riley betrayed me..
The friend responds What are you going to do to her?.
Aubrey responds I will fill her tank with pure oxygen instead of the usual safe formulation..
The friend responds Won't that kill her?.
Aubrey responds Nah, I just want to scare her..
The friend responds Maybe you should check first how dangerous your plan actually is..