Alex realized he was going off track: "Oh sorry.  I get lost when i express what i like."  He didn't want to comment back about that champion bit she threw at him, cause he knew in his heart that he was not better than anyone else.  And that would be shown when he looks at his kit and his tools and pauses.

Alex: "... um... okay..."  When he picks up the first runner that has the first piece mentioned in his manual, he was trying to place the cutter, but his hands were a bit shaky.  Apparently when it came to Gunpla building, he did not have the most steady hands.