v0.3.0: improved previous hunger mechanics changes, now better coded & clarified

src/com/shatteredpixel/shatteredpixeldungeon/levels/CityBossLevel.java

@@ -177,7 +177,7 @@ public class CityBossLevel extends Level {
 		if (!enteredArena && outsideEntraceRoom( cell ) && hero == Dungeon.hero) {
 			
 			enteredArena = true;
-            locked = true;
+            seal();
 			
 			Mob boss = Bestiary.mob( Dungeon.depth );
 			boss.state = boss.HUNTING;
@@ -208,7 +208,7 @@ public class CityBossLevel extends Level {
 		if (!keyDropped && item instanceof SkeletonKey) {
 			
 			keyDropped = true;
-            locked = false;
+            unseal();
 			
 			set( arenaDoor, Terrain.DOOR );
 			GameScene.updateMap( arenaDoor );