The Angels lose but Oliver doesn't

Darren Oliver has been pitching surprisingly well recently. Since the beginning of June, he has a 3.08 ERA, with 17 strikeouts to 14 innings pitched. He has only walked three batters in that time, along with 15 hits, leading to a decent 1.23 WHIP over the past month-and-a-half or so. You know what his problem is? His main purpose is as a left-hand specialist, but what kind of specialist has a 2.79 WHIP against the hitters he is supposed to be special against? Lefties are batting .431 against him, a number looking more like an on-base percentage than a batting average.

If a guy is batting in a stadium with a retractable roof, like Rogers Centre in Toronto or Chase Field in Arizona, and half-way through his at-bat, the roof is opened: does the at-bat go in his split stat section as an indoor at-bat or an outdoor at-bat I wonder?