blood and thunder
n.— «We hear about the horrors of fishnet burn, a fishscale pattern some skaters get when they fall down on the track while wearing fishnet stockings. I’ve also heard about a practice drill called “blood and thunder,” in which skaters take the track, knocking each other off until just one remains.» —“My starring roll” by Pam Leblanc Austin American-Statesman (Texas) May 21, 2007. (source: Double-Tongued Dictionary)