NeoTokyo, Japan

Grimace stands there and takes the bullets, knowing none of them can kill him.

Omega keeps shooting.

Deku: Robot guy, you realize that isn't working, right?

Omega: So I see.
Omega starts shooting flames at Grimace instead.

Deku waits for him to stop attacking.

Grimace leaps off the crate to dodge the flames.

The flames follow Grimace.

Grimace is lit on fire. Though he's probably in pain, thanks to fire getting into the wounds, this still isn't fatal.

Omega fires rockets at Grimace.

Grimace uses the crates as (very flimsy) shields to avoid the rockets.

The Deku shoots rocks at Grimace.

Grimace shoots the rocks out of mid-air.

Omega runs up to Grimace and punches him in the jaw.

The Deku shoots Razor sharp leaves at Grimace.

Being that Omega is considerably stronger than Grimace (the former being a robot and all), this hurts. Grimace dodges the razor leaves. The sprinkler system finally turns on, putting out the fire on Grimace.

This powers the Deku up. She shoots boulders at Grimace.

Grimace jumps on the boulders and uses them as stepping stones to kick the Deku in the face.

Meanwhile, Sadako arrives at his hideout: the Presidential Suite of NeoTokyo's finest hotel, the Aneki.

Omega grabs Grimace by the foot and slams him into some crates.

The crates break open, revealing the broken-down machines that used to pump Grimace Gas.

Omega slams Grimace into the machinery.

Grimace: You can do this all day, but you won't kill me.

Omega: Then I shall shall subdue you.

Grimace: For what? Everyone thinks I'm dead. Any bounty, reward, or whatever for capturing me is now gone. People will think I'm a lookalike.

Omega is shocked at this, but it's hard to tell.
Omega:...My files say you are still wanted.

Grimace: You really need an update, my friend.