When tragedies like the one you describe strike the workplace, the immediate response is usually obvious - engaging first responders and immediate needs. Days later, supervisors wonder, "What's my role in helping everyone? What do I say? How do I act?" You will make a huge impact on employees with the simplest things: being more available, being empathetic, engaging PAS, modeling your own need to process and share feelings, being a good communicator, making it easier for others to spend time discussing or processing their reactions, finding ways to lighten the load, and being flexible with work demands. You will be surprised how employees will thank you later. You may think to yourself, "Wow, I didn't do much." But in fact, you really did all that was needed. Supervisors represent the organization, and tragic events are always remembered in terms of how "the organization responded." That's you.