Astudent fell down while running on the trail. the bone is protruding. the swollen and painful led is severely bruised. what is the immediate risk? and the first steps to take?

The immediate risk is it could get or be infected depending on how large the cut is. the first step to do is to cover the womb and stop the blood flow.

You did not show us the image of the burger, but i shall try to answer as best i can.  when purchasing food, always consider the ingredients as well as the person who prepared it. consider if they were hygienic people or not, in case the burger was infected with bacteria. no mortal should place an infected burger into their mouth.