I think he meant if you get a F3 proc on your Fire 1 after the first two Fire IVs, you can follow it up with F4x2 > Fire starter Proc > Swiftcast > Fire 4 > Convert > Fire 4 > Blizzard III, which is what I have been doing for a while. Thats of course assuming there are no mechanics targeting you soon and you don't care about using swift there.
