Local Pressure Curtain (LPC) is a proposed multi-layer fluid curtain that generates a controlled, modest negative pressure change (ΔP on the order of a few kilopascals) around a protected object or region. Instead of relying on massive rigid barriers, LPC combines three coupled mechanisms in a thin, reconfigurable boundary: (1) a microjet fog rail that injects a dense sheet of micron-scale droplets, (2) a pre‑cooled veil that conditions those droplets near 0 °C, and (3) a synchronized CSI (Cavitation–Shock Interaction) acoustic field in the 20–40 kHz band that seeds and shapes a population of gas bubbles. Together, these elements redistribute and partially attenuate modest overpressure fronts (≈1–10 kPa) from laser-induced plasmas, short-range acoustic bursts, and micro‑impact surrogates, while helping reduce microscale barotrauma in nearby sensors or biological phantoms. We frame LPC as a conservative, small-impulse concept: it is not intended to cancel large blasts (≫10 kPa) or to act as a weapon-scale shield. Instead, it operates in the regime where droplet inertia, bubble-mediated acoustic impedance mismatch, and post‑event thermal buffering can plausibly yield 20–40 % reductions in peak overpressure at sub‑meter distances for microsecond–millisecond transients. We present a simplified analytic decomposition of the pressure response into phase, momentum, and acoustic terms; outline a minimal P0 architecture with realistic water and power budgets (≈200–300 W·m⁻²); and propose a 2D numerical modeling strategy to estimate attenuation under different parameter sets. A staged 90‑day validation plan is specified, from bench‑scale shock-tube and laser-plasma tests to bio‑phantom experiments and cautious small‑charge field trials. The article is purely theoretical: all numbers are target values or scaling estimates, not experimental results. The goal is to provide an honest, falsifiable framework that others can simulate, prototype, and test using shared MRV (Measurement, Reporting, Verification) specifications.