estaban protagonizando
Imperfecto progresivo para el sujetoellos/ellas/ustedesdel verboprotagonizar.

protagonizar

Sí, solo que era una +18, y la estaban protagonizando.
Yeah, only it was NC-17, and they were both starring in it.
Se integró en los acontecimientos, comprendiendo sus leyes subyacentes y las fuerzas sociales que estaban protagonizando la revolución.
He integrated himself into the course of events, grasping their underlying laws, and shaping the social forces that were to carry through the revolution.
Palabra del día
la huella