We have strayed from the pitching convo, but I think it means that diving for a sinking line drive with runners on, or barehanding the slow roller, or throwing home on a rope from deep right after the runner has made her turn around third or 2b diving for the foul ball near the fence 100 feet up the line, not only takes tremendous skill, but a certain level of badassery/cockiness that you could even attempt those plays. Players who hesitate on that ball in no-man's land, or with where to throw, or who you've never seen go all out or dive for a ball...that's hard to coach into them after a certain point.