Wow, I stared at that last panel forever before I finally figured out what I was looking at...

i still dont know what the fuck.

redsheet said:
i still dont know what the fuck.

That's because the translations are incomplete. You can read "Wriggle" written in the last panel (note added). My guess is that Keine is headbutting the crap out of Wriggle...

Oh, it's just Wriggle getting caved. Moving along~

Keine. Knows all the history of Gensokyo, but has no idea Wriggle is part of team 9 too =D

the bugs for fairy pranks have to come from somewhere