Pusher is that rare thing - an episode Nick is unable to find much of a fault with at first. Blackly comedic and engaging, this cat and mouse encounter between Mulder and the titular Pusher is so good.
We do get into Mulder's pretty incredibly specific knowledge of the Japanese language and how this episode might have damaged whatever burgeoning relationship Mulder and Scully have been building.
We struggled to say much about Teso Dos Bichos ultimately. Other than we could totally watch The Relic (the 90s monster movie, not the more recent housebound horror about dementia) for a similar (very similar) setup and have a far better time.