"Don't worry" Jack felt the words just slip out, he knew his mistake instantly, realizing that his face was betraying him and all those words could ever do is make someone worry. Jack stumbled on trying to talk his way out of it
"It took me a while to find you after I eventually came back, Garrett was most irate that I got in his way."
Jack took a deep breath stammering breath knowing at this point he had to tell her the truth, but he was worried that the shock would make her hurt herself.
"This isn't going to be easy to hear but I know you'd want to know, first you have to promise me that whatever I'm about to say you won't try and move as you'll tear your stitches."
Not really knowing how she would react Jack gave Jemma time for his words to sink in and for her mind to process her situation, she was a doctor she knew what being where she was meant, but they do say Doctors make the worst patients.