Great idea but what to do when it tries to inject venom on the legs before swallowing? 
Anaconda ain't have no venom on them: https://answers.yahoo.com/question/index?qid=20090603113645AAv6YzR 
Topic: What to do in case you are attacked by an anaconda. - page 3. (Read 1584 times)
Great idea but what to do when it tries to inject venom on the legs before swallowing?
Unfortunately for anacondas consumption of humans hasn´t played a meaningful part in their evolution otherwise they´d have figured out long ago to start with the head end or if that´s not practical make sure that the prey is stone dead before consumption starts.
Male or female anaconda? If the latter ...
1. If you are attacked by an anaconda, do not run. The snake is faster than you are.
2. Lie flat on the ground. Put your arms tight against your sides, your legs
tight against one another
3. Tuck your chin in.
4. The snake will come and begin to nudge and climb over your body.
5. Do not panic
6. After the snake has examined you, it will begin to swallow you from the feet
and - always from the end. Permit the snake to swallow your feet and ankles.
Do not panic
7. The snake will now begin to suck your legs into its body. You must lie
perfectly still. This will take a long time.
8. When the snake has reached your knees slowly and with as little
movement as possible, reach down, take your knife and very gently slide it into
the side of the snake's mouth between the edge of its mouth and your leg, then
suddenly rip upwards, severing the snake's head.
9. Be sure you have your knife.
10. Be sure your knife is sharp.
Good luck!
2. Lie flat on the ground. Put your arms tight against your sides, your legs
tight against one another
3. Tuck your chin in.
4. The snake will come and begin to nudge and climb over your body.
5. Do not panic
6. After the snake has examined you, it will begin to swallow you from the feet
and - always from the end. Permit the snake to swallow your feet and ankles.
Do not panic
7. The snake will now begin to suck your legs into its body. You must lie
perfectly still. This will take a long time.
8. When the snake has reached your knees slowly and with as little
movement as possible, reach down, take your knife and very gently slide it into
the side of the snake's mouth between the edge of its mouth and your leg, then
suddenly rip upwards, severing the snake's head.
9. Be sure you have your knife.
10. Be sure your knife is sharp.
Good luck!
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