*As Undyne plays her guitar we do the only reasonable thing one can do in such a predicament.
*RUN!
Undyne: "Ooooh Human I'm tougher and rougher and stronger than any warmonger up above! So cease this struggle or you'll be buried with Waterfall’s rubble!"
*Undyne rips off a chunk of a pillar and launches it into the bridge's foundations. The wood underneath us begins slipping into the water below. Forcing us to run up the bridge and jump to the remaining stable wood.
Frisk: 'Shit!'
*Undyne stands before us, guitar at hand. She swings it at us like were a baseball.
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*We eat one of our two Cinnamon Bunnies to minimize the damage. Yet that is little help against the plated warrior that stands before us. And fleeing is not an option either...not anymore at least.
Frisk: 'No issue, that just means we need to push right past her!'
*You take a bold step forward.
Undyne: "Oh? You're approaching me human? Instead of running away, you're coming right to me?"
Frisk: "References huh? Well, up above I learned a technique from a great master. One that even you can't withstand."
*You cup your hands together.
Undyne: "...I-i knew it! So you humans CAN use ki to make laser beams! Well, I've trained many nights-"
Frisk: "Who says its ki?"
Undyne: "N-Nani?" (jokes)
*What the fuck is happening?
Frisk: "Yes, you see we humans know many systems of 'magic'. It could be... Chankra, or Nin, or perhaps I'm simply unleashing the might of my quirker. Or-"
Undyne: "YAAAAH!"
*Undyne's screams somehow makes her armor look even tougher! She points at you thuggishly.
Taken from Royal Road, this narrative should be reported if found on Amazon.
Undyne: "It doesn't matter what you bring human, I, Undyne, carry the hopes and dreams of all monsters, my spear is the one that shall pierce your heart and bring salvation to my people's-"
Frisk: "Neo Genesis Devil Ultima SLASH! *Tm"
Undyne: "AH!"
*Instinctively Undyne blocks to survive whatever secret technique you'll unleash at her...while she's defending you move around her and dash ahead.
Undyne: "H-huh? AHHH! DAMN YOU HUMAN! COME BACK AND FACE ME LIKE A REAL...umh... LIKE WHATEVER YOU ARE!"
*Undyne gives chase once more. Restarting her shredding to send a volley of spears at us!
Undyne: "I'll give you this human, your persistence and resistance shows that you'll go the distance against me! But I'm the reigning champ fighting for everyone's happiness! So you'll need to try a little harder than this if you want to survive till the end of DAYLIGHT!"
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Frisk: 'Oh come on! We're dodging them!
*Yet they still nick us.
Frisk: 'Ugh!'
*You grit your teeth and pick up the pace.
Undyne: "Quickening up? Great! That pace was boring me anyway!"
Frisk: "Look! I'm not that bad of a...okay never mind I'm awful! But I'm not doing anything wrong right now! Can't you just-"
Undyne: "Let you off the hook? No way! Do you have any clue how...wait, you're just trying to keep me from rhyming! WHY YOU! This human's going to be dying from the undying pursuit of Undyne! So they best quit trying and lying and accept their SPEARFUL end!
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Frisk: 'Ugh! This chick isn't like Papyrus at all!'
*Yes, as unfortunate as it is it seems like will need to restart this section to-
Frisk: "Grass!"
Undyne: "Yeah! I'll turn your ass into grass food! Then-w-wait STOP!"
*We conceal ourselves in the tall grass.
*You look around.
Frisk: 'Still no Pokemon.'
*NOT the right time Frisk.
Frisk: 'Why not?'
*You notice that Undyne is RIGHT ABOVE US!
Frisk: 'Ah fudge.'
*You ball up and try to hold your breath like you're underwater. But the pressure only grows as Undyne takes a step closer to You. Her hand out to-
Monster Kid: "Y-yo! U-Undye-"
*Undyne not so gently drops Monster Kid to the ground. She takes a few stabs around the grass, one of which gets uncomfortably close to your head, before leaving with balled fists. (or)
*Well...that was lucky.