Trait Silence! Not working?

Am I doing this wrong? Silent One’s last trait is supposed to silence enemies when doing skull damage - but no one gets silenced on skull damage. What am I missing?

Is Silent One the top troop? Usually “do X on skull damage” only applies to the individual actually hitting, not the whole team.

Yes I just figured that out. It’s a bit confusing that they don’t explicitly state which troops have to be first spot and which don’t in a consistent way e.g. “When in first position.”

Thanks for the response!