Adapted from a digest by 小草 on FMZ Quant, '5天赚80倍，高频策略的威力' (2020-11-04, https://www.fmz.com/digest-topic/6228). The source runs a sub-second maker bot on the Binance FIL perpetual. It infers short-term direction from recent aggressor trades and sizes up when volume surges. The author says it only works when a market is highly active and contested, and was mostly idle otherwise. The sub-second maker version cannot be tested here: our backtests are taker-filled, and at 100ms holds the capture sits far below the ~0.10% round trip. Our 6-month taker_ratio history is also too short. This hypothesis keeps the author's two claims, that aggressive one-sided flow predicts the next move and that the edge exists only in rare high-activity bursts. It moves them to a horizon that pays for the fees. It is a single-leg, long-short, pure-OHLCV strategy on FILUSDT.BINANCE (the author's own instrument, with 1H history back to 2020-10-16, about 52k bars). It stays flat until a one-hour bar shows an aggressor burst. A burst needs three things: an absolute 1h log return >= 4x the trailing 30-day std of hourly returns, dollar volume >= 5x the trailing 30-day median hourly dollar volume, and a close in the outer quarter of the bar's range on the side of the move (close-location value |CLV| > 0.5 with the same sign as the return). CLV is our bar-level proxy for aggressor imbalance. The strategy enters in the burst direction at the next bar and exits after exactly 4 hours. Pre-screen on FIL 1H (non-overlapping events): 172 events, mean signed 4h forward move +0.64%, positive in 6 of 7 calendar years (2023 was -0.32%). Honest caveat: that cell was the best of 18 screened (3 symbols x 3 holds x 2 thresholds), so the selection is disclosed. Neighbouring cells were weaker: FIL 12h +1.06% but mixed by year; FIL z3/v3 at 4h only +0.05%. The deflation step should count this. The same rule on DOGE gave +0.37% and on LINK +0.06%, so we expect the edge to be FIL-specific and fragile.