I dont have a theory what Sharingan ability Madara used in this moment (bottom left panel the eye)
I will let others to theorise what eye technique just happend.
Didnt you notice how the "action" suddenly disapeared? Just after the previos panel you can see here the moon and madara and Hashirama calmly standing where is the action the apperent attack both of them where trying to do?
No something drasticly changed, I belive Madara used a eye tech or even genjutsu to apear that Hashirama at the end stabbed Madara.
note: the moon obviosly important in this panel, it's a reminder of the moons eye plan (what jutsu did Obito want to use to create it??)