Thanks for your thoughts!:-)) The weapon is used after kissing Molly.
That image appears when you "kick up" when you rescue Finley!
If you "kick up" it, the heroine's text afterwards will change! (mainly when she kisses Finley and when Finley persuades her in the shield ending)
Sorry, there may be a lot of branching by choices! A detailed chart is in the DL folder!