If you are good at Azir, Nasus will be under CS and under gear at level 6, and not full HP, if he try to push the lane into your tower, since Azir out range Nasus. Assuming same skill level on both side.
What he did here to Syndra is extremely difficult to do. This is a very tough matchup for Azir and he single handedly destroyed her without jungler help and he made it look easy. Kudos! I wish I can play him like that. Interesting itemization path though. Any particular reason for not rushing Nashors tooth?
As an Azir Onetrick, I found this fun to watch. I think the spacing games is what matters the most in this matchup when it comes to the laning phase. Pantheon's W has a very decent range that you have to be aware of at all times when trading with him. I think the Azir in this video did an amazing job at that, only failing to properly space Pantheon's W once at 0:06. I think the Pantheon being aware of this was very smart in his mind games at 2:38 when he turnt around for a split second to trick Azir into thinking he was walking back so that he could walk up thinking it's safe to poke him now before turning around and W'ing him. Very smart intellectual gameplay. I love watching 2 smart players try to exploit the other's weaknesses and capitalize on their mistakes, *SO FUN* 😄