why this can't be declared elsewhere confuses me

lib/resque_utils/capistrano.rb

@@ -4,38 +4,40 @@
 
   namespace :resque do
 
-    set :resque_pre, "cd #{current_path} && RAILS_ENV=#{environment} bundle exec rails runner"
-
     namespace :failed do
-
+  
       desc "Requeue all failed jobs"
       task :requeue_all do
+        set :resque_pre, "#{current_path} && RAILS_ENV=#{environment} bundle exec rails runner"
         run "#{resque_pre} 'ResqueUtils::requeue_all'"
       end
-
+  
       desc "Remove all failed jobs"
       task :remove_all do
+        set :resque_pre, "#{current_path} && RAILS_ENV=#{environment} bundle exec rails runner"
         run "#{resque_pre} 'ResqueUtils::remove_all'"
       end
-
+  
       desc "Requeue specific failed jobs (specify with '--set exception=SomeErrorHere)"
       task :requeue_specific do
         if exists?(:exception)
+          set :resque_pre, "#{current_path} && RAILS_ENV=#{environment} bundle exec rails runner"
           run "#{resque_pre} \"ResqueUtils::requeue_all('#{exception}')\""
         else
           raise ArgumentError, "No exception was specified, use '--set exception=SomeErrorHere'"
         end
       end
-
+  
       desc "Remove specific failed jobs (specify with '--set exception=SomeErrorHere)"
       task :remove_specific do
         if exists?(:exception)
+          set :resque_pre, "#{current_path} && RAILS_ENV=#{environment} bundle exec rails runner"
           run "#{resque_pre} \"ResqueUtils::remove_all('#{exception}')\""
         else
           raise ArgumentError, "No exception was specified, use '--set exception=SomeErrorHere'"
         end
       end
-
+  
     end
   end