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! : )