They're parodying one of the battles from Gundam Unicorn, Zuikaku's holding something that resembles a chain mine, used here then later gets slammed by a rocket booster that Unicorn/Kaga detached.
Kaga Kai-2: Launch!!
It seems Kaga will be coming in Kai-2 form starting from today's maneuvers.
Kkrrmmm
Baaam!
Oh, yeah?
Rryaaah!
Pang
Kaga-san!H-...how are you flying!?I'm still good to go.