I don't know if I have a colic baby or whatever but my 3-week-old son is always crying and doesn't go to sleep well, that is, until I turned on this video. I am not kidding. I wish I could film this he is literally snoring right now.
Instead of Qf1, he could have played Qd1+! White is forced to take; and then we have Rd3+ (a double check from the rook and bishop) followed by Rd1# whichever way the king moves.
I love watching Eric but I'm left scratching my head 90% of the time. He moves something like a pawn to a3 and says it's cutting of the bishop's move from f3 to e4, and I'm thinking how, i assume its because he's 5 moves ahead, but we never find out because he's already prevented it.
Its very hard for the players to discuss the intent of their moves during blitz games. I recommend you watch Daniel Naroditsky’s (or Eric’s) speedrun videos. They are usually rapid games, 10 minute minimum, where the player has much more time to analyze and explain moves in real time. It is my preferred format of chess content for learning from these brilliant players.