As the event begins, introduce a single difficult adversary or a group of adversaries to the scene. These adversaries immediatly start cleaving through the panicked crowd, dealing as much damage to the civilians as possible (narratively). You gain 2 Fear and the spotlight immediately shifts to one of the adversaries.

The street was buzzing with people before the adversary showed up. Now, everyone is trying to escape, making movement beyond Very Close range very difficult. If a PC tries to move faster through the crowd, they must succeed on an Agility Roll.
On a failure, they take 1d4+2 physical damage as the fleeing crowd catches them off-guard, pulling them underneath them and trampeling them. The PC is Vulnerable until they get up from the ground during their next action.

Activate a Progress Countdown (8) which ticks down after every adversary or PC action, regardless of outcome. Once completed, all civilians have fled the scene.

The adversary attacks a group of civilians, slaughtering them all in cold blood. All PCs within Far range must lose a Hope and you gain a Fear.

Spend a Fear to force a PC to make an Agility Reaction Roll. On a failure, they take 1d6+1 physical damage as they slip on the blood drenched stones and fall to the ground, becoming Vulnerable until they get up from the ground during their next action. On a success, they must mark a Stress instead.

Spend a Fear to have the crowd gather around one of the PCs after the adversary has made an attack against the civilians, Restraining them and force them to mark a stress. The PC can free them with a successful Strength or Agility Roll to maneuver through or push away the panicked masses or on a successful Presence Roll by convincing them of an action.

On a successful Presence Roll, the Panicked Crowd Progress Cooldown ticks down by 2 instead of 1.