Chiaki, on the other hand, is pretty sure she knows what's going on here. Now freed from the energy prison, she's able to concentrate on watching the battle. And after seeing Lucrecia's Flare go unanswered, followed by Sonic suffering a counterattack, she has an idea of what's probably happening.

"It's changed its attack pattern. Hit the left side with magic. The right side is probably the opposite, so try physical on it. That's a pretty common boss fight trope on console RPGs."

Every so often, her gaming ways come in handy. And now that she's back up, feeling refreshed from Chrom's healing, and still under the effects of Haste, she lets loose with a Magitek Laser against the left side and a Magitek Missile on the right. That should confirm her theory.

"...Yup, that's it. Give it all you've got, everyone!"