Deadlock simulation example...

Following an example from a book displayed on the image, I am executing code a and b given below starting at steps:
1a, 1b, 2a, 2c, 3a, 3c, etc.

Question: Why am I not coming across <blocked> at step 6b?  Please see the image for 6b.
Cose a:

--1a
use TSQL2012;
begin tran
select '--1a:   ' + cast(@@TRANCOUNT as varchar(10)), @@TRANCOUNT

--2a 
update hr.Employees 
set phone= N'10004'
where empid= 1
select '--2a:   ' + cast(@@TRANCOUNT as varchar(10)), @@TRANCOUNT

--3a 
--(excute next in b)

--4a
update Production.Suppliers 
set fax= N'555-1212'
where supplierid= 1
select '--4a:   ' + cast(@@TRANCOUNT as varchar(10)), @@TRANCOUNT
--5a
--<blocked>

--6a 
-- (excute next in b)

-- 7a
select '--7a:   ' + cast(@@TRANCOUNT as varchar(10)), @@TRANCOUNT
if @@TRANCOUNT >0 rollback;
select '--7aa:   ' + cast(@@TRANCOUNT as varchar(10)), @@TRANCOUNT

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Code b:

--1b
use TSQL2012;
begin tran;
select '--1b:   ' + cast(@@TRANCOUNT as varchar(10)), @@TRANCOUNT

--2b
--(excute next in a)

--3b
update Production.Suppliers 
set fax= N'555-1216'
where supplierid= 1
select '--3b:   ' + cast(@@TRANCOUNT as varchar(10)), @@TRANCOUNT

--4b
--(excute next in a)

--5b
update hr.Employees 
set phone= N'555-9999'
where empid= 1;
select '--5b:   ' + cast(@@TRANCOUNT as varchar(10)), @@TRANCOUNT

--6b
--<blocked>

--7b
select '--7b:   ' + cast(@@TRANCOUNT as varchar(10)), @@TRANCOUNT
if @@TRANCOUNT >0 rollback;
select '--7bb:   ' + cast(@@TRANCOUNT as varchar(10)), @@TRANCOUNT

Select all Open in new window