User blog comment:Miskos3/Fairy Tail Chapter 419: The Message of Fire, Review/@comment-121.54.54.40-20150207161410/@comment-7418318-20150207172343

Natsu also used flames that didn't burn anything on at least two occasions. First in his fight against Erigor to pull himself back onto the bridge and later in the KotSS arc to make a hand/liana combo.

If the surrounding building caught in fire, the text of the message would quickly get lost after all. :P