Joshua listened to the conversation then went on passively, most of his attention on Thomas. This didn't stop him from mentally wanting to strangle Reno when the mage went and did something random, namely he shot a dark spell into the sky. He prayed Amaya didn't seem that and think it was him. However he also got to take note of Thomas' reactions to the dark spell and they were somewhat revealing. Thomas not only gritted his teeth to the point that the candy cane in his mouth broke and he grabbed his armored arm.
~~So that's how it is~~ he thought to himself, also noting Thomas' change in tone when speaking after the spell.

When Joshua spotted the Cy-bug that came out of a hole in the ground, Joshua's expression turned serious. He stepped forward to get in front of the other
"You four go on ahead." he said, summoning his keyblade" I'll handle ugly here and catch up to you later. We can't let these things run wild by the looks of this one, which means we can't afford to be delayed. So get your asses down that hole right now while I do some exterminating. If you meet up with the others, try to help them... and make sure Amaya is okay for me will ya?"