Short version: Path of Flame lets Flame Shock seems to go up to an unlimited duration on two or more targets. (Easiest with two)
Slightly longer version: Noticed today that when there are two targets, my Path of Flame increases the Flame Shock duration on the second target without limitation.
Here's how it works:
Let's say there are targets A and B close together.
You put Flame Shock on target A, let's assume a 30sec duration.
You use Lava Burst on target A, when Flame Shock has i.e. 28sec left. ---> target B has Flame Shock with 28sec left
Flame Shock on target A, duration gets increased to 39sec.
LvB on A when 37sec left ---> B SHOULD get 37sec, but instead B gets 37sec X 1.333 = 49 sec duration
LvB on B when 47sec left ---> A gets 62sec duration Flame Shock.
Now LvB on A when it has 60sec left ---> B now has 80 sec Flame Shock duration.
You can continue that as you like, on one of our Elisande Fights tonight I got the Flame Shock on her up to a 6 MINUTES duration.
Can anyone confirm that this bug is happening to them, too? Don't think it's intended to work like that...
IMPORTANT: Tried testing it on training dummies... yeah... uhm... can't get Path of Flame to work on them -.-" (not even the 85 ones in OG that stand like 3m away from each other >_>)
So if you want to test it yourself, you'd have to find targets with somewhat high HP on which Path of Flame DOES work :/