For an Item you first find guarded by a nasty Green Dragon, the Wind Flute is a bit anticlimactic. Sure, Cyclone 13 is a powerful Ability, and with only a 20% break chance, you will most likely get a few uses out of this Item, but still. It's not like any all-target Spell is going to do significant damage at this stage of the game. It can put weakened targets over the edge in some cases, though, and may be useful just for cleanup duty.