MHP3 Final Urgent Quest: Amatsumagatsuchi

My final urgent quest for Monster Hunter Portable 3rd.
Took me 38 minutes for this first try.
Gonna find some other ways to kill him faster with melee.
I sure hate it when Amatsu flies into the sky and shoot the water beam.
Do not know how to avoid all of them.
And by luck I found out about using the binder when I first tried it on him for fun =P

Time to go unlock my own Alatreon!