There's an even larger gap between a Klingon and his armor, yet the almost five seconds it takes to vaporize him consumes his armor completely while leaving his gunnery console untouched.
The big air gap would be between a standing person and the wall behind him. The gap between a Klingon and his armor would be about the same as between a Klingon and the ground he's standing on - but the difference would be that the armor is made of more or less the same stuff as the Klingon. It's not iron or steel, obviously, but something you can punch a knife through.
That's pretty convenient when somebody gets vaporized while standing on grass or something.
Some of the grass may be lost - but we couldn't tell, because phasers don't scorch. No temperature change, remember?
Yeah, a rare high point in Star Trek battlefield makeup.
I'd say "a rare Star Trek battlefield" instead. We don't get those often. The last time was, what, "Battle Lines"? The next would be "AR-558". Things like "The Ship" don't really count as field battles... And others such as "To the Death" invoke special rules on firearms and rayguns.
Timo Saloniemi