User blog comment:Hidden Scorpius XI/My impressions on "Punishment" (V4-E7)/@comment-4023909-20161226004538/@comment-4010415-20161226012305

If Qrow has to keep up with both fighting and keeping Ruby safe, it drags him down. Basically, with Ruby involved in the fight, she holds him back. And that's exactly why he got cut and injected with venom.