Mr. Ahmadi, an out of shape 45 year old man, was advised by his physician to lose weight and to exercise on a regular basis. He followed his his diet faithfully and began to jog daily. One day, while on his morning jog, he heard a snapping sound that was immediately followed by by severe pain in his right lower calf. When his leg was examined, a gap was seen between his swollen upper calf region and his his heel, and he was unable to plantar flex that ankle. What do you think happened? Why was the upper part of his calf swollen?