Intimidating Scream
This "encourages frequent yells and bellows in combat to intimidate foes, making any psychological resistance rolls inflicted on an opponent one grade harder". You can take an action to inflict a penalty on others in combat - for the purposes of this skill, you can use Influence to just scream at them. Might not be Standard though.
Note, "psychological effects" do include Compelling Surrender and Pin Down, so handy there too.