"They seem happy together, but they also seem very cautious. It's almost as if they spend time trying to figure out how to define their relationship or figure out how the other person is feeling. For example, they came up with 'adjectives' to describe where they are between like and love," Harrison wrote in his Entertainment Weekly blog.
"Now the fact that they actually came up with verbs, and not adjectives, is something I know mortified every English teacher in the world, but that's not the point. The point is while their outward appearance is happy and free, their words still seem cautious."
However, Harrison toldTV Guide it's not a big deal Forester didn't tell Hartsock he's in love with her although fellow bachelor Chris Siegfried expressed the same notion during Monday night's episode.
"Not at all. She has a lot of security with Brooks. Chris definitely laid it on the line and it was glaring that Brooks didn't say it because he had the other one-on-one date, but with his non-verbal communication, she felt extremely confident," the host told the magazine.
Hartsock apparently also felt very confident in her relationships with remaining bachelors Drew Kenney and Zak Waddell at this point in the season.
"The final two-on-one date was really a foregone conclusion. Unless one of these guys went completely nuts on her she likely knew that both of them would be getting a rose this week," Harrison wrote in his EW blog.
"The only true decision would be who would get the rose on the date and who would have to wait for the rose ceremony... Drew went a little further than Zak and professed his love to her and he ended up getting the rose, but again, at this point, she already knew Zak would get one as well."
According to the host, the only bachelor Hartsock was unsure about was Michael Garofola, and it wasn't because of anything he necessarily did.
"Michael was definitely put behind the eight ball this week. After two incredible dates with Brooks and Chris, the guy just didn't stand a chance. Maybe if he'd gone first things might have been different, but after being with two men she definitely sees a future with, her feelings and relationship with Michael just didn't measure up," Harrison wrote.
"You could really see it in Des' body language and hear it in her voice... Looking back, I'm not totally sure that the two-on-one where he went after Ben didn't doom their relationship."
As for what's to come, Harrison teased something surprising during his interview with TV Guide.
"The rest of the season is very intense and the biggest hurdle for Des has yet to come," he explained.