David, I understand where the confusion might lie.
First, let's establish a basis. The Risk Management Knowledge Area does not include any Executing Process Group activities. Review Table 3-1, 5th Edition, p. 61.
Second, now here you have the PMBOK telling us we should implement our risk response plan in the Monitor and Control Process. Okay, great, but how do you actually implement all those activities in the Executing Process Group without a Risk Management Knowledge task under that Process Group?
Third, the PMBOK answers that question by directing us to implement those risk response plan activities in the Direct and Manage Project Work task within the Project Integration Management knowledge area.
Does this answer your question?