طـَفَـأَ to go out, to blow out (by itself)
أَطـْـفَــَأ to extinguish, to make sthg gone out, to blow sthg out, to switch off
Imperative اَطـْفـــْأ atfe'2 (e sounds like i of "this")
Yes ! It is the rightest way to carry a hamzah after a mukassar letter; which I have missed while I was trying to find haakaat on my non-Arabic keyboard.