Title pretty much.
I've been playing a Pyrokineticist, and came with a little ambiguity in the rules.
Since for a fire elemental kineticist, it is useful to have multiple fire sources around available for abilities such as Smokestorm which can only be initiated from a fire source, it became an issue to figure out what is considered a fire source.
As a player i thought if Burning infusion sets an opponent on fire, that opponent then becomes a fire source for so long as the fire isn't extinguished, but the issue started when that burning opponent died.
I had assumed, that, as with all things that die from burning... you know.. Keep burning afterwards, and could be used as a new source of fire.
But my DM thought that because the infusion doesn't state how long the fire lasts, that the Burning would disappear immediately on the opponent's death.
That ruling would therefore force me to either only be able to use smokestorm on a burning opponent that is still alive, or to 1: Find or carry things that catch easily on fire and dispose of it somewhere convenient, 2: use basic pyrokinesis and spend a standard to cast Spark. 3: Wait for my next turn before using Smokestorm.
Sorry if it's been discussed in the kineticist playtest, but.. 4750 posts to comb through...