This is another "be prepared" scenario for us to ponder...
Suppose you get an urge to throw a few flies. You sneak out of work an hour early and drive to a secret spot on the river you've been wanting to try. You park your truck on the side of an old unfrequented dirt road you'd discovered on an earlier trip, grab your gear and head down a slow gradual embankment cluttered with rocks, boulders and brush. You are filled with excitement as you near the bottom, your footing lets loose, you slide downward. On your slide you disturb a rock, which breaks free a large boulder. You stop your slide and the boulder comes to rest on your leg, specifically your foot, ankle and halfway up your shin. You are on your back. You assume your foot/ankle/leg is broken, but have suffered no more apparent injuries other than scrapes and bruises from your fall. Your leg and foot is in much pain.
Remember that you have snuck out of work! Nobody knows where you are, what you are doing or when to expect you home. You are dressed in normal riverwear, including waders, a vest, a sidearm and you still have all of your fishing gear except for your rod which was lost on the fall. There is NO electronic communication available.
What do you do?