On the topic of Felmyst breaths, I made this video from some clips I used while Serious Casual was learning Felmyst. Hopefully this will be of use to people who, erm, can't read German.
Serious Casual teaches Felmyst Breaths By Vulajin
The important thing is to pick a consistent approach to breaths. Sp00n's post two above mine calls for reacting principally to what my video refers to as "north" and "far south" breaths, while the "south" breaths are handled as a consequence of those reactions. My video labels "north"/"south" as the breaths to which we reacted, while far south was handled as a consequence of those reactions.
If you use sp00n's strategy, then the tricky side is probably west, because she can fly south when she's doing a breath either in the "harmless" middle area or in the fire, where you might be standing. If you use SC's strategy, then the tricky side is east, because she can fly north when she's doing a breath either on the tree or on the middle area.