Almost TPK

[Raellus]

I don't think so. I mean, I suppose it's possible, assuming that the shooter is extremely lucky, but the scenario as described is highly implausible.

Sometimes, rules have to take a back seat to referee common sense and judgment. I'd rule that the sniper would have to make minor adjustments- in other words, re-point her weapon, at the very least- in order to engage each new target in turn. That takes time. During that time, the folks under fire would be reacting- scattering, diving for cover, etc. Combat is not turn-based in real life, and the standard rules don't take that into effect. This is where common sense and referee judgment should really come into play, IMHO.