I didn't read it as aggressive, more like engaged in the discussion, he really wanted to get to the bottom of things and get his views and opinions challenged,

I didn't read it as aggressive, more like engaged in the discussion, he really wanted to get to the bottom of things and get his views and opinions challenged, but UB was a bit defensive and closed. Even though UB has strong opinions he wasn't as engaged in building a case for them, he just tried not to budge or maybe he conceded smaller points and then retreated to a less dogmatic stance.