1. You need to stop the bleeding immediately. Put strong pressure on the wound if blood is coming out of the wound. For heavy bleeding, don't be afraid to use your knee to press hard. Use whatever's available (gauze, towels, a shirt, etc.) as dressing. 
2. Don't elevate their legs. Instead, sit them in a comfortable position if they are conscious, or in recovery position (on their side, with the top leg bent at a right angle) if they are not. 
3. Wait for paramedics to arrive.
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