Maybe because I watched the videos? Did you? Here are others who noticed something was up with the first one:
WaPo
But several of his questions confused viewers, and seemingly Comey himself, and he occasionally was incoherent. He referred to “President Comey,” and at times looked confused and frustrated with Comey's answers.
NYT
Senator John McCain became an unexpected focus of befuddlement and concern on Thursday after a line of questioning that appeared to conflate two separate F.B.I. investigations during James Comey's testimony before the Senate Intelligence Committee.
Fox News
“You’re going to have to help me out here. In other words, we’re complete, the investigation of anything former Secretary Clinton had to do with the campaign is over, and we don’t have to worry about it anymore?” McCain asked.
“I’m a little confused, senator,” Comey said.
He wasn't the only person 'confused' by the Arizona Republican's line of questioning.
As for the second (post-blood clot operation) video, I haven't seen anyone comment that McCain seemed confused, frustrated, incoherent, befuddled, etc. Have you?
And I don't know what "Bad_luck redirection" means. Don't really care,either.