[Intimidating as Ygnodentus does indeed look, Undyne is also not easily intimidated – all part of being a hero, of course! She did make a little note of his body language before approaching. The last thing she wants to do is get into an actual life-or-death fight with one of her new, uh, living…mates.

Hey, though, she doesn't get imitated very often! So that's cool. Why people don't imitated her very often will likely be made clear soon.]

Fufufu, so you're copying me, huh? Well, let's if you can copy THIS!!!

…And I won't attack you, so don't worry. Cheap shots aren't my style AT ALL.

[ a) is that something you should say to somebody whom you just randomly pointed a spear at? b) he literally can't because what she's about to do involves having spear.

Behold: Undyne flawlessly executes a series of tricks that involves flipping it around and spinning it every which way, behind her back, between her legs somehow, etc. It ends as she flips one so that it whirls in the air, inches from slicing up the ceiling, then she catches it and does a pose.

Applause would only encourage her.]