The context here is that the dude ultimately lost to his clock expiring, after developing a favorable board state. He was attacking with a Necropolis Fiend that I did not have an answer for (at least not in-hand; I did have answers in my deck). He clocked out of the match while one or two swings away from killing me and I guess he thinks it was lame for me to not scoop it up?
I actually really enjoy the unique tension you get in some MTGO matches where you deduce that your path to victory is the opponent’s clock. I know it’s a miserable way to lose – I’ve been there myself a few times, for sure – but it is a sweet way to win when you’re really up against the wall on-board.