Undertale the singing movie

5. battle with Papyrus

We see the team got to the road to waterfall and when they saw Papyrus on the other side of the road Sans went to Papyrus's side and when Papyrus checked Sans soul he became shocked and said

Papyrus: Sans! your hp is now 100! how did you, Nitro and Doggo gain more hp when you didn't kill any of the monsters!?

before Sans could answer Nitro went up to Papyrus and said

Nitro: it was those level up orbs that is in the underground, he got 50 hp when we got the first level up orb, now he has 100 when Fia gave us a second one

Papyrus then became happy when he heard what Nitro said and then he turned to Sans and said

Papyrus: brother, I, the great Papyrus, am so proud of you, not only were you able to get your hp from 1 to 25, but you now have 100 hp

Sans was surprised of what Papyrus said he was shocked and said

Sans: bro, that was so shocking that I am lost of what joke to say

and with that out of the way Papyrus turned to Nitro and said

Papyrus: Nitro, the time has come for me to take you down with my key-tar, by song

Papyrus then took his key-tar out and Sans brought out his trombone meaning Nitro, Doggo and Flowey have to use their instruments to battle the skeleton bros.

(road to waterfall)
Battle 8.1 [song]
Nitro (120/120 hp)  Doggo (280/280 hp)  Flowey (6,000/6,000 hp)
Group hp (6,400/6,400)
Vs
Papyrus (680/680 hp)  Sans (100/100 hp)
Group hp (780/780)

Bonetrousle, sung by Papyrus, Sans and Nitro

~Papyrus~ en garde now, Nitro

now you face Papyrus

Though the guards failed to stop you

I can do it alone

So be prepared for

The ultimate tussle

As you try to show your muscle

In this battle of bones

I see your face

you run all over the place

you don't have to say it Nitro

I said it when you and I first met

Please understand

I am in such high demand

I'm a skeleton with standards

Mostly for spaghetti

Please don't feel blue

Even though I'll capture you

~Sans~ cause you can do anything

~Papyrus~ all I have to do is try

Undyne will see

I can be a guard indeed

~Sans~ yeah, there's just that kid you need

~Papyrus~ I just hate to say goodbye

Maybe one day

We all can be friends

And when that day arrives

I know we'll have lots of fun

But until then, I've got to

Capture you, since your a human

~Sans~ but you're trying to become best friends with one