"This is an environment that is filled with all personality types, so of course it is unrealistic that everyone will get along... At the time, I never knew [Corinne and Taylor]'s issues with one another was this intense, but of course I was aware of tension," Viall wrote in his People blog following Monday night's The Bachelor episode on ABC.
"I knew that Corinne's assertiveness and occasional napping had rubbed some of the other women the wrong way. I was also aware that Taylor is a person who will confidently state her opinion, personal and professional."
Viall explained that he viewed Olympios, 24, as a colorful woman who's full of life.
"I love how assertive she is, and I admire the confidence that she has even under pressure. She never seems to lose sight of who she is," Viall noted.
On the other hand, Nolan, 23, was a bachelorette whom Viall found "undeniably impressive."
"It's attractive how successful and driven she is in her career, all of which she worked hard for. It's interesting, for a woman who carries herself like Taylor, to allow herself to open up emotionally," Viall wrote.
"And like Corinne, she is a woman who stands by who she is and what she wants in life. I decided then that a two-on-one date would be the best to navigate these relationships."
Olympios and Nolan were also a good fit for the two-on-one date becauseThe Bachelor star revealed his relationship with each woman -- although different -- was "probably equal" in terms of how far they had "progressed" at this point in the season.
"There were things about both women that intrigued me, but also plenty I still had questions about. I had never been to the bayou before, but man, how fitting was it for this date," noted Viall, who took the ladies on an airboat ride through the New Orleans swamp.
"I reminded myself going into this date that there are two sides to every story. When Corinne shared her side of the story with me about Taylor, I was shocked."
Olympios told Viall that Nolan was a bully who had called her stupid and acted entitled around the other girls. The blonde beauty from Miami, FL, also accused Nolan, a mental health counselor, of appearing on The Bachelor for the wrong reasons.
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"I wasn't going to fully ingest the information until I spoke with Taylor, but it was still disappointing to hear. Once I sat with Taylor, it became more clear what the issues were about," Viall wrote.
"When you strip it down, it became clear that Taylor believed Corinne lacked the emotional maturity to get married or really to be dating me at all. Listening to Taylor talk, it became obvious to me that Taylor didn't realize that she was guilty of the same thing she saw in Corinne."
Viall clearly didn't view Olympios as the bad guy in this situation despite Nolan insisting the promiscuous bachelorette was manipulative and full of lies.
"Like Corinne said, Taylor was telling Corinne that she didn't call her stupid while implying that she was stupid," Viall stated. "You can say a lot of things to someone while being pretty clear between the lines."
Viall therefore gave Olympios the two-on-one date's rose and eliminated Nolan from the running for his heart.