Yep, and that 15 percent warning hits different mid line.

Honestly, it's just a small portrait, people cry over anything.

Checking every single paver with a level sounds good in a demo but nobody actually works that way on a real job. You would be there for a week on a normal size patio. The trick is getting your base right and your first row dead on, then you can trust your lines and only spot check here and there as you go. The mallet tap is real, you do want each stone set tight, but a level on every piece is overkill if your prep was solid. That guy knows his stuff, he just also knows he is putting on a show and not trying to finish before the weekend is over.