hangup fails to stop application execution

documentation says:

"hangup() Hangs up the current channel. After this command is issued, your application will stop executing. ..."

dialplan.rb:

hangup_is_broken {

puts "BEFORE hangup()"
hangup
puts "AFTER hangup()"
sleep 5
puts "WAY AFTER hangup()"

}

ahn stdout:

INFO agi: Handling call with variables {:dnid=>15126000516, :channel=>"SIP/xaY99Kka96-089263f0", :type=>"SIP", :callingpres=>0, :calleridname=>"Walker Wayne", :uniqueid=>1242856110.169, :request=>#<URI::Generic:0xb76a4fe8 URL:agi://127.0.0.1/>, :callingtns=>0, :rdnis=>nil, :query=>{}, :callerid=>5123107012, :accountcode=>"", :context=>"hangup_is_broken", :network=>true, :extension=>"s", :type_of_calling_number=>:unknown, :language=>"en", :callingani2=>0, :priority=>2, :enhanced=>0.0}
BEFORE hangup()
AFTER hangup()
WAY AFTER hangup()