My supervisor, Denise, met me before my first shift.

She showed me an empty conference room where I could take a break if needed, and introduced me to a peer support specialist.

She did not ask for details about Mark.

She asked whether I had a plan if a difficult call brought back memories.

“I’ll tell you,” I said.

“That’s the plan,” she replied.

“You don’t have to prove you can sit through everything without reacting.”

For the first hour, the calls were ordinary: a stalled vehicle, a worried neighbor, a minor traffic collision.