Umupira w'amaguru ni umukino uteje akaga. Rugby igomba kugaragara nk'umukino wa kabiri wica cyane nyuma y'imirwano niba imikino yose ifatwa nk'iyangiza. Ni iki koko ingofero y'umupira w'amaguru ikora? Mu by'ukuri, iki kibazo gishobora gukemurwa byoroshye. Umusego w'umwuka uri mu ngofero y'umukinnyi ukora nk'uburyo bwo gukingira no kurinda. Mu mikino ya NFL ishyushye, ibyuma birinda umunwa ni ingenzi mu gukumira imvune ku maso y'abakinnyi no ku menyo. Gukomereka mu gace, gukomereka ku ruhu, gukomereka kw'ingingo, gukomereka kw'imitsi, n'izindi mvune bikunze kugaragara muri rugby, ariko gukomereka mu mutwe bifitanye isano cyane cyane na rugby kandi ntibishobora no gufatwa nk'indwara za rugby. Nubwo haba hari ubwirinzi ku ngofero, imvune zikomeye ntizishobora kwirindwa burundu.

Ifatwa nk'ibikoresho bya siporo bishya, ingofero itekanye cyane mu mateka ya NFL. Abakinnyi benshi ba NFL bambara iyi ngofero. Ariko yari igenewe koroshya umutwe w'abakinnyi ba NFL. Abahanga mu bya siyansi, abaganga b'imitsi n'abahanga bakoze iyo ngofero basobanuye neza ko itazarinda indwara zo mu mutwe. Nta ngofero n'imwe ishobora kubikora.