Using Entities to influence Flows

I am currently using Botpress 11.9.0 with Recast as the NLU. My bot is supposed to take whatever the user inputs ‘why did you take the mirror’ and based on whatever object, in this case, ‘mirror’, reply with the proper description, but currently I am unable to accomplish this. I am trying to have my entities control the conversation flow, but cannot figure out the raw expression for it. Do you have any suggestions or solutions?