Do you guys not know how heat works? Heating a metal object that fast is fine since the metal can withstand the heat. Heating a person that much, that fast would either cause burns or would just be painful
She's a witch, but the way she uses her powers is so mundane that I can help but think her broom is basically a flying bicycle. If we change it to that, her biking alongside the train at breakneck speeds to try and deliver some documents is a little hilarious.