In traditional shock cases, this is generally the relieving of pain from injuries or the stopping of blood loss. In an acute stress reaction, this may be pulling a rescuer away from the emergency to calm down, or blocking the sight of an injured friend from a patient.
With this system, Pericles succeeded in keeping the courts full of jurors (Ath. Pol. 27.3), and in giving the people experience in public life. As Athens' ruler, he made the city the first and most important polis of the Greek world, acquiring a resplendent culture and democratic institutions.
Peisistratus, tyrant of Athens, is a classic example; he made three attempts to seize power, finally succeeding in a military coup in 546 bce by using forces from outside, and ruled for 30 years. But tyranny was more complex than Aristotle implies.