Heiji's expression is flat at the thought of Kudo being hurt, and he jumps a little at the sound of Kudo's voice from inside his head.

The worst wouldn't just be injury, Hattori.

Hattori gets it, just from Kudo's tone of voice.

"What happened ta neechan?" His tone is promising all sorts of retribution for the person responsible. He wants to ask about this 'god tree' as well - Kaito's ears are sharper than his - but first he wants to hear about what happened to Kudo, so he waits.