The patch minimovies are made for isolated patches with simulations of the Hodgkin-Huxley equations and only include the standard HH Na, K, and leakage channels along with the membrane capacitance. When the K channels are blocked, and the membrane is only permeable to Na, the voltage will go to ENa. Because the membrane is so depolarized, now all of the Na channels will inactivate and the only open channels remaining will be the leak channels. Thus, with time, Vm will go to Eleak.
As for mammalian non-myelinated nerve, the Belluzzi and Sacchi paper that you quote lists three different K channels in that axon. We are not familiar with the details of this paper and the relative sensitivities of these conductances to TEA but presumably the repolarization is due to one or more of the channels being insensitive to TEA and still available to repolarize the axon. You are correct that the minimovie teaches principles rather than exact conditions for particular axons. Even amongst mammalian axons there would be variability in the particular channel types and their pharmacology. Our aim was to teach principles and the minimovies were designed only as an introduction to the basic physiology of nerve function.
Thanks for your interest in NIA. I hope you can use the movies anyway and progress from there to showing your students the complications of adding more channels to a patch or an axon.