U-Healy ngumvelisi weempahla zemidlalo oqeqeshiweyo odibanisa ngokupheleleyo izisombululo zeshishini ukusuka kuyilo lweemveliso, uphuhliso lweisampulu, intengiso, imveliso, ukuthunyelwa, iinkonzo zolungiselelo kunye nokuguquguquka kophuhliso lweshishini kwiminyaka eli-16.