You should continue to discourage this behavior, because it is will more negatively affect Rupert than benefit him.
Rupert will: Most likely never be able to play Football again. Can face charges because it is illegal. Cancer of the bone, skin, liver, or heart because you are putting a foreign substance in the body. This can also cause heart problems such as heart disease or heart attack. *** There are many more so please let me know if you need more. Hope this helps! : ) ***