I've mentioned this before but it continues to stand out with every clip that I watch... Armstrong's quick decision making is an absolutely elite AFL quality. It's one of the most important qualities that determines a star player, in my opinion.
He's a player who has 2-3 actions in a sequence where most KPFs have 1.
The play at 3:45 in the clip below is a perfect example of it paying off. He is positioned to run onto the spoil, but it doesn't happen, so he tackles, then the split second that the ump signals a free he is sprinting forward into space. And he gets a goal out of it.
But even the play at 3:39. It's a nothing play but he's in that marking contest and before he even lands he is already thinking about how he is going to hunt the ball and apply pressure.
Just don’t muck around and take him at 2.