Even in the midst of the darkest tragedies, heroes will emerge.
McGill was hiding under a car when he found the shooting victim in desperate need of medical care.
The 26-year-old, who lives in Orlando, relayed the story in a post to Facebook that has rapidly begun amassing thousands of likes and shares across social media.
McGill explained how he was able to extend the man’s life using the only tools at his disposal: their clothes.
“I tied my shirt and his shirt over his wounds to stop the bleeding and got him secretly to the nearest officer who then transported us to the ER,” he said.
The post details the sheer terror of the situation and how McGill was able to react in the do-or-die situation.
“Words cannot and will not describe the feeling of that. Being covered in blood.. Trying to save a guys life that I don’t even know regardless that I’m fine..just traumatized,” he said.
McGill also spoke to CBSN about the ordeal, where he described how he had to push against the blood pouring from the victim's wounds as they ran through the parking lot.
"I applied pressure with my hand and we proceeded to dodge and weave throughout the parking lot," he said.
The 26-year-old said he struggled with the trauma of the event and the things he promised to that unknown man.
"The things I had to say to the guy and make promises I didn't know I would be able to keep or not to keep him conscious while holding him as tight as I could and blood everywhere on me," he said.
The student hopes that he will be able to get in contact with the man he saved as the gentleman was only able to relay his name: Rodney.
"It sucks because all I got was his name and I can't even see if he's okay because I'm not related," he said.
"If anyone knows of a guy named Rodney that was shot and injured tonight.. Please let me know he is okay."
McGill felt as though there was a higher power behind why he remained at Pulse nightclub rather than going home earlier.
"I felt God put me at the club and made me stay behind to help a complete stranger. For whatever reason that may be.. I don't know, but I do know it was hopefully to save his life," he said.
The post has been shared over a 1000 times since being posted less than a day ago with almost 7000 likes.
It is one of the first personal stories of heroism to come from the incident, as earlier reportage captured the incredible lines at blood donor centres.
It was reported that many blood centres had reached their capacity after hundreds of people queued to donate.
Centres urged potential donors to make appointments so they could return over the next week and replenish supplies.