What Happens

No one escaped from the Landlady before, therefore Billy can't be the smartest one to escape. He could't be the ONLY one that had escaped from her. Besides, if he escaped, he'll be dead soon, because the tea was poisoned with the "bitter almond taste." If Billy escaped and then die on the streets, the Landlady could just go out and collect his body. The other two gentlemen will be upstairs in the preserved collections waiting for more gentlemen to join their group. Billy may not even realize what he had gotten into, he might still be drinking tea and touching those stuffed little pets. Billy was really too naive to drink tea that's prepared by a woman that stuffs her little pets after they've passed away.