How do blood replacements and replacements work in community rugby?

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Blood injuries (Law 3.25) A player with a blood injury leaves the field and may be temporarily replaced. They return as soon as the bleeding is controlled or covered. If they can't return within 15 minutes (actual time) of leaving the playing area, the replacement becomes permanent. A player must not keep playing in kit contaminated with blood (Law 4); bloodstained clothing is the only reason a player may leave the pitch to change. Head injuries: in community rugby there is no Head Injury Assessment (HIA) temporary replacement. Any player with signs or symptoms of concussion is removed permanently (RFU Regulation 9); HIA protocols only apply in specified elite competitions (Prem, Champ Rugby, Premiership Women's Rugby and the U18 Academy League). Rolling replacements: under Law 3.34 a match organiser may allow rolling tactical replacements at defined levels, so whether they apply depends on the competition you're refereeing. Without them, a tactically replaced player can only come back on to replace an injured front-row player, a player with a blood or head injury, or a player injured by foul play. Sent-off players may not be replaced in community rugby.