The author sold 250x 315C and 150x 312.5C calls, betting the price action was overdone when the underlying traded around 310-311. The mechanism is mean reversion from an overextended move, with the trade already profitable as the calls decayed from .53 to 2.35 and .93 to 6.1 in value. The author explicitly states they were not expecting a rip to 319, implying a capped upside view. Main risk is a continued breakout above 315.