Har-Prakash is not only one of Shinzen's students, but he is also a senior facilitator and the principal curator of Shinzen's videos.
My impression of what they are talking about is that "wandering mind" distraction comes typically in the form of See In and Hear In, which are obvious, but also Feel In, which is less obvious. That is the "cheer", or happy aspect, the pleasant tone of the wandering thought, the emotional quality of it being interesting. The idea that Har-Prakash and Shinzen are discussing is to use that "cheer" (Feel In) as the vector along which to recycle the reaction. What that would look like in practice would vary depending on focus range and technique (which are not discussed in the video), but could be as simple as noting "Feel" (i.e., Feel In) to label the pleasure of becoming distracted, and thus not actually becoming distracted.
