For both pathways, the allenyl azides cyclize to give triazafulvene intermediates which could be trapped by nucleophilic solvents to generate the corresponding NH-1,2,3-triazoles. The [3,3]sigmatropic rearrangement and the abstraction of proton were the determining steps for the course of the Banert cascade. The difference between the energy barriers of those steps were in agreement with the experimental results.