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4:43 look at vishy glancing at dubov after realising the blunder and to check his reaction to confirm it and dubov is like "I know dude just rip the bandage now"
Because after Be3 instead of Ra1, after Rxc1+ Bxc1 Rd1+ forks the king and the bishop and White will go down a piece. I am giving the alternate timestamp reference 4:45 so you can calculate and see for yourself.
Is abroad people rarely address each other with 'sir' , they do it when they donot know the person or have met them for the first time. So it is perfectly fine for Sagar and even Vishy would encourage this I believe.