When I do 5-0s on round rails I tuck the rail against the heelside wheel and tweak it crooked a little bit and if you're hauling enough ass and standing right above it it grinds just fine no heel drag necessary, with that said I skate flatbars and would never in a million years 5-0 a handrail unless I had a gun to my head and the hospital bills that would almost definitely ensue were covered by someone other than me. Also if you want to drag your heel if it makes you feel better why not, basically all of us didn't notice that shit until he pointed it out himself so why do we even care