Help with last act on insane

I know your pain.
I was doing insane solo (arcade) earlier this month,
took me 5hr (2 days) to kick Myrrah's a**

playin in arcade with mutator like instagib, unlimited ammo and super reload,
if you don't have any of these mutator
maybe you could try my way:

first and second part of fighting Myrrah is rather easy,
the real problem is the last part (where Myrrah climb and attack the tower)

Upon 3rd part started, spot Myrrah so your AI teammates will fire at her
then roadie run to right, on the 2nd ammo (there's a big crate near it),
get ready to kill 2x locust (I chainsawed them)
and pick up their hammerburst
then fill up ammo,
(the theory is you *should* have 2 weapon that fire rapidly and long distance)

run to the escalator where you ascend to here from Adam Fenix's office,
and then shot Myrrah until she falls off the tower.
Now she'll come after you, just cover behind the escalator,
shoot with lancer/hammerburst/retro lancer (retro lancer is the best...but arcade reset your weapon in beginning)
if she fire the ray-of-death just stay cover and blind fire
keep fire until she fall down (she'll switch side)

Once she's on the ground then roadie run to hammer of dawn and fire her,
if you see those shrieker (flying stuffs) kill them first (Myrrah recover rate are very slow)
repeat until she's flying again.
*IMPORTANT* immediately swap hammer of dawn to any primary rifle (hammerburst/lancer/retro lancer)
and repeat the escalator trick again

just do it a couple of time and eventually she'll die.


in short, always hold 2 weapons,
only pick up hammer of dawn when Myrrah is down,
when Myrrah flying always go back to the escalator

and you need abit of luck too