upd

Code/Inventory/Usable/UseSystem.cs

@@ -2,14 +2,17 @@
 
 public static class UseSystem
 {
-	public static void TryUse( IUseContext context )
+	public static bool TryUse( IUseContext context )
 	{
 		foreach ( var useable in context.GetUsables() )
 		{
 			if ( useable.CanUse() )
 			{
 				useable.Use();
+				return true;
 			}
 		}
+
+		return false;
 	}
 }