I did some searching and supposedly the technique is called:
沸遁・巧霧の術
Futton - Koumu no Jutsu
I'm not good enough to say what would be a good translation but looking at some dictionaries:
沸 (fut) = seethe; boil; ferment; uproar; breed
遁 (ton) = flee; escape; shirk; evade; set free
巧 (kou) = adroit; skilled; ingenuity
霧 (mu) = fog; mist
術 (jutsu) = art; technique; skill; means; trick; resources; magic
For 沸遁 and 巧霧 I find no words in the dictionary. They do like to put together kanji to form new ones.