hubieran comentado
-they/you had discussed
Past perfect subjunctive ellos/ellas/ustedes conjugation of comentar.

comentar

Lo normal hubiera sido que se hubiesen implicado, o que hubieran comentado algo entre ellos, que hubieran manifestado de algún modo que estaban allí, aunque no activos, por lo menos presentes y conscientes.
It would've been much more normal for them to try and be involved, or to comment in some way, to somehow indicate that they were, if not exactly participating, at least present and aware.
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