What do you do when you hear shots first fired? And, later, what do you do after the shots have long since been fired?
These are questions that many involved in the response to the deadliest mass shooting in modern American history in Las Vegas earlier this week are no doubt asking themselves.
The latter question is one that physicians at the Orlando Regional Medical Center have answered for themselves: teach.
"Monday really brings it all back almost immediately," said Dr. Chadwick Smith. Smith was on call at Orlando Regional Medical Center on June 12, 2016 when a gunman stormed Pulse Nightclub, killing 49 people and injuring 58 others.
Since then, Dr. Smith and others who work at ORMC have visited hundreds of hospitals, passing on their knowledge and experience to others who might have to deal with similar situations.
Smith spoke in Las Vegas months before the shooting earlier this week.
“In a moment like this-- it is all hands on deck, with every organization possible that could be responsible for taking care of these patients,” said Smith.
And, thankfully, many hands were on deck when shots rang out at that Jason Aldean concert. The venue was packed with medical professionals and first responders who quickly went to work.
"People doing CPR, people trying to carry people and I just couldn't not go help them," said Dr. James Sebesta. Sebesta was in the crowd that night. He recently retired as a career army surgeon with four combat tours. His military and surgical skills kicked in.
Sebesta was encouraged to see other medical professionals and regular citizens jumping in to assist victims, the answer to that first question thoroughly answered.
"Everybody that was on that field whether they were skilled or not, helped carry somebody off that probably lived," he said.
The world reacted to the Las Vegas shooting.