estaban desencadenando
Imperfect progressiveellos/ellas/ustedesconjugation ofdesencadenar.

desencadenar

Tantos acontecimientos se estaban desencadenando que, por el momento, se olvidaron completamente de que el Maestro había anunciado que uno de ellos lo traicionaría.
So much had been going on that, for the time being, they had quite forgotten about the Master's announcement that one of them would betray him.
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midnight