Kwallon kafa wasa ne mai haɗari. Dole ne a sanya Rugby a matsayin wasa na biyu mafi hatsari bayan faɗa idan duk wasanni ana ɗaukarsa mai cutarwa. Me ainihin kwalkwali na ƙwallon ƙafa yake yi to? A zahiri, ana iya magance wannan matsalar cikin sauƙi. Matashin iska da ke cikin kwalkwali na ɗan wasa yana aiki azaman gyarawa da kuma hanyar kariya. A lokacin wasannin NFL masu zafi, masu kare bakin suna da mahimmanci don hana rauni ga fuskoki da haƙoran 'yan wasa. Kuraje a gida, raunuka a fata, katsewar haɗin gwiwa, raunin tsoka, da sauran raunuka sun fi yawa a wasan rugby, amma bugun jini yana da alaƙa musamman da rugby kuma ba za a iya ɗaukarsa a matsayin cututtukan rugby ba. Ko da tare da kariyar kwalkwali, ba za a iya hana manyan raunuka gaba ɗaya ba.

Ana ganinsa a matsayin wani kayan wasanni masu juyin juya hali, kwalkwali mafi aminci a tarihin NFL. 'Yan wasan NFL da yawa suna sanya wannan kwalkwali. Amma an tsara shi ne don rage wa 'yan wasan NFL rauni. Masana kimiyya, likitocin jijiyoyin jini da injiniyoyi waɗanda suka tsara kwalkwali sun bayyana karara cewa ba zai hana bugun zuciya ba. Babu kwalkwali da zai iya yin hakan.