wd-12 section 2.2.3.1 question

Is the third subcase a typo or editorial leftover?

 

The One-Way Pull Message Exchange Pattern

 

This MEP involves a single ebMS
user message. The message sending is initiated by a Sending MSH

either:

 

as a SOAP One-way MEP instance,

as a SOAP Request in a SOAP
Request-Response MEP instance, or

as a SOAP Response in a SOAP
Request-response MEP instance.

 

 

The One-Way Pull Message Exchange Pattern of section 2.2.3.2
of course has a single ebMS user message that is transferred as a SOAP Response
in a SOAP Request-response MEP instance.

 

So what is the third case supposed to capture?