try to implement removing huds and proper HUD messages when players quit out and when gems no longer exist

src/entities.lua

@@ -94,7 +94,8 @@ minetest.register_entity("gems_battle:great_gem",{
             local arena = arena_lib.get_arena_by_pos(self.object:get_pos(), "gems_battle")
             if arena and arena.in_game and self._teamID and arena.teams[self._teamID] then 
                 if arena.teams[self._teamID].team_eliminated then
-                    self.object:remove()
+                    arena.teams[self._teamID].gem_hp = 0
+                    self.object:set_hp(0)
                 end
             end
         end

src/hud.lua

@@ -132,7 +132,7 @@ function gems_battle.update_hud(arena,p_name,as_spectator)
 
     -- handle timer HUD
     player:hud_change(p_huds.timer, "text", arena.current_time)
-
+    local active_teams = arena_lib.get_active_teams()
     -- great gem
     for t_id,teamdata in ipairs(arena.teams) do
 
@@ -200,11 +200,17 @@ end
 function get_great_gem_images(arena,team)
 
     local team_id = gems_battle.get_team_id_by_name(arena, team)
+    local is_active = arena.teams[team_id].gem_exists
     local percent = ((arena.teams[team_id].gem_hp/32))*100
+
     local color = gems_battle.get_color_code(team)
 
     local great_gem_border = "gems_hud_border.png"
     local great_gem_border_simple = "gems_hud_border_plain.png"
+    if not(is_active) then
+        great_gem_border = "gems_hud_border_elim.png"
+    end
+
     if arena.teams[team_id].attack_flash then
         great_gem_border = "gems_hud_border_attack.png"
         great_gem_border_simple = "gems_hud_border_plain_attack.png"
@@ -218,5 +224,9 @@ function get_great_gem_images(arena,team)
         great_gem_image_simple = [[[combine:16x40:0,0=gems_hud_border_plain.png:4,1=gems_hud_overlay.png]]
     end
 
+    if not(is_active) then
+        great_gem_image_simple = "blank.png"
+    end
+
     return great_gem_image,great_gem_image_simple
 end

src/minigame_manager.lua

@@ -84,6 +84,12 @@ end)
 arena_lib.on_prequit(mod, function(arena, p_name)
     if not arena.spectators[p_name] then
         leave_arena(arena,p_name)
+        local teamID = arena.players[p_name].teamID
+        local team_name = arena.teams[teamID].name
+        if #arena.teams[teamID] == 1 then
+            arena.teams[teamID].is_eliminated = true
+            arena_lib.HUD_send_msg_all("title", arena, S("@1 team has been eliminated!", gems_battle.get_capname(team_name)), 3, nil, gems_battle.get_color_code(team_name,false,true))
+        end
     end
 end)
 
@@ -93,13 +99,19 @@ arena_lib.on_time_tick(mod, function(arena)
         -- handle gem destruction
         for team_id, team_data in ipairs(arena.teams) do
             local team_name = team_data.name
-            if arena.teams[team_id].gem_hp == 0 and arena.teams[team_id].gem_exists == true then
+            local team_data = arena.teams[team_id]
+            local gem_hp = team_data.gem_hp
+            local is_eliminated = team_data.is_eliminated
+            local gem_exists = team_data.gem_exists 
+            if (gem_hp == 0 or is_eliminated == true) and gem_exists == true then
                 --The great gem is missing! Now the players shall die.
                 -- send msg and switch off gem_exists
-                local uc = gems_battle.get_capname(team_name)
-                arena_lib.send_message_in_arena( arena , 'both' ,  S("@1 team's Great Gem has been destroyed! They will not respawn!",minetest.colorize(gems_battle.get_color_code(team_name),uc)) )
-                local numbercolor = tonumber("0x"..string.sub(gems_battle.get_color_code(team_name),2,-1))
-                arena_lib.HUD_send_msg_all("title", arena, S("@1 team's Great Gem has been destroyed!",uc), 3, nil, numbercolor)
+                if not is_eliminated then -- if is_eliminated is true then they were eliminated by quitting.
+                    local uc = gems_battle.get_capname(team_name)
+                    arena_lib.send_message_in_arena( arena , 'both' ,  S("@1 team's Great Gem has been destroyed! They will not respawn!",minetest.colorize(gems_battle.get_color_code(team_name),uc)) )
+                    local numbercolor = tonumber("0x"..string.sub(gems_battle.get_color_code(team_name),2,-1))
+                    arena_lib.HUD_send_msg_all("title", arena, S("@1 team's Great Gem has been destroyed!",uc), 3, nil, numbercolor)
+                end
                 arena.teams[team_id].gem_exists = false
             end
         end