Don't think it's Wriggle saying the last line, despite the speech bubble pointing at her, since "Atai" is Cirno's trademark Personal Pronoun. (along with Komachi and Orin.)

wriggle speaking with a closed mouth then would be quite impressive xd

Kurai1321 said:
wriggle speaking with a closed mouth then would be quite impressive xd

Wriggle vibrates her "cape" to produce a variety of sounds that we hear as words.

Arael said:
Wriggle vibrates her "cape" to produce a variety of sounds that we hear as words.

Can't unhear this in David Attenborough's voice.

glasnost said:
Can't unhear this in David Attenborough's voice.

DAMN you for making me hear this.