from my understanding of how the lazers in dust work, its from the continual contact of the stream that generates heat , now in real life the principle of lazers is quite similar how ever real lazers can cut through 1/4 inch steal in litelary a split second
so the idea of the two lazers meeting mid stream as it were would super intensify the power of the lazers sight of contact
on the mollicules within the air possibly being able to cause sone form of "explosion" well not really but super heated gass
which is what the air arround the points of contact could in theary become is technically plasma, so this could bring about an
interesting tactic of two lazers in the same team strategically doing the ghostbusters thing to effectivly create small plasma pockets on the battle field, not this is only possible for sustaind crossing of the streams , as the light would need to focus on the one spot for several seconds at least. this is all just theary however, Experaments in our time have now shown light to have some of the properties of corporial matter for instence there has been experaments using glass beads just under a nanometer in size where lazers have been used to rearange there pattern look it up on youtube its really quite cool , so if the lazers in this hae some sort of physicle mater like properties it would be entirely possible for a feed back loop to formthere by intensifying the return beam with the strength of the two beams combind back into the lazer rifle, this is all just theory however is a cool thought to ponder over .

I never said the lazer producer plasma I said if the air arround the points of contact were to be superheated the air would effectively become plasma . It was just a cool thought to ponder over .