The context of the following conversation is Jesse called them into the room knowing that it would be locked behind them and then filled with poison.:
Jesse says I have a good plan to take care of these people once and for all.
The friend responds What are you going to do with them.
Jesse responds I'm going to secretly call them into this room and when they're not looking I will fill it with poison that they can't see.
The friend responds I don't think they will ever find out what you're doing too.